OPERATOR’S MANUAL for
CARBINE, 5.56MM MK 18 MOD 0 NSN 1005-01-527-2288
Distribution Statement D: Distribution authorized to the DoD and DoD contractors only; due to specific Authority (Public Law 90-629-ARMS EXPORT CONTROL ACT AND DoD 5230.25 WITHHOLDING OF);
WARNINGS
1. Be sure to clear weapon before disassembling, cleaning, inspecting, transporting or storing.
2. Stay clear of muzzle and always keep weapon pointed down-range.
3. Keep clear of muzzle.
4. Keep safety on until ready to fire.
5. Never open the weapon’s action if the barrel is extremely hot and you suspect there is a live round in chamber.
7. When ammunition and weapon are exposed to the sun on a hot day, a cook-off can occur within 150 rounds of continuous firing. 8. Do not allow cartridge primer to hit any hard surface or it may fire. Dispose of live rounds appropriately.
9. Ensure that the action is closed before beginning disassem-bly.
10. All personnel shall wear approved single hearing protection devices during training exercises.
11. Ensure there are no obstructions in the barrel.
powder grains in the receiver or bore and for a bullet stuck in the bore. Remove unburned powder or bullet from bore before resum-ing firresum-ing. If the bullet is stuck in bore, return the weapon to the armory.
13. If your weapon stops firing with a live round in the chamber of a hot barrel, remove the round fast. However, if you cannot remove it within 10 seconds, remove magazine and wait 15 minutes with the weapon pointing in a safe direction. This way you won’t get hurt by possible round cooking off. Regardless, keep your face away from the ejection port while clearing a hot chamber.
14. If an audible ‘Pop’ or reduced RECOIL is experienced during firing, immediately CEASE FIRE.
16. Do not load with a hot chamber.
17. Do not fire if water is present in the barrel. 18. Do not interchange bolts between weapons.
19. Before starting functional check, be sure to clear the weapon. DO NOT squeeze the trigger until the weapon has been cleared. Inspect the chamber to ensure that it is empty and no ammunition is in position to be chambered.
20. To be considered SAFE before disassembly, cleaning, inspecting, transporting, or storing, the weapon must be cleared. 21. Before starting an inspection, be sure to clear the weapon.
in position to be chambered. Do not keep the ammunition near work area.
22. Before starting an inspection, be sure to clear the weapon. Do not keep live ammunition near work area.
23. Your weapon is now loaded. Ensure it is pointed in a SAFE direction.
24. Be sure the cam pin is installed in the carrier assembly. If cam pin is not installed, your weapon can still fire and will explode. 25. DO NOT FIRE: Seriously corroded ammunition, dented car-tridges, cartridges with loose bullets, cartridges exposed to extreme
CAUTIONS
Do not interchange bolt, gas cylinder, and trigger group with other weapons.
Be careful not to accidently fire your weapon when inserting gloved fingers into trigger area.
Disassemble using steps m through q only when dirty or damaged. Do not use wire brush or any type of abrasive material to clean alu-minum surfaces.
Selector lever must be on SAFE or SEMI before closing upper receiver.
Do not use a screw driver or any other tool when removing the hand-guards. Doing so may damage the handguard and/or ship ring. If the upper RIS is removed without first loosening the screw at the muzzle end, components may be damaged.
Avoid storing and transporting the VBLII with batteries installed. This reduces the chance of accidental activation and equipment damage due to heat build-up and battery leakage.
Operator’s Manual for
CARBINE, 5.56MM MK 18 MOD 0 NSN: 1005-01-527-2288
Distribution Statement D: Distribution authorized to DoD and DoD con-tractors only; due to specific Authority (PUBLIC LAW 90-629-ARMS EXPORT CONTROL ACT AND DoD 5230-25 WITHHOLDING OF) 1 April 2005. Other requests shall be referred to Commander, Code 4081 NAVSURFWARCENDIV, 300 Highway 361, Crane, Indiana 47522-5001. Destruction Notice: Destroy by any method that will prevent disclosure of contents or reconstruction of this document.
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS Errors in this publication or recommendations for its improvement shall be sent to:
COMMANDER Crane Division
Naval Surface Warfare Center Attn: Code 4081, Bldg 2521
300 Highway 361 Crane, Indiana 47522
Table of Contents
WARNINGS . . . .1-i CAUTIONS. . . .1-vi CHAPTER 1 INTRODUCTION . . . 1-1 SECTION I. GENERAL INFORMATION. . . 1-1 1-1. SCOPE. . . . 1-2 1-2. CORROSION, PREVENTION, AND CONTROL
(CPC).. . . 1-3 1-3. REPORTING EQUIPMENT IMPROVEMENT
RECOM-MENDATIONS (EIR). . . 1-4 SECTION II. EQUIPMENT DESCRIPTION. . . 1-5 1-4. EQUIPMENT CHARACTERISTICS, CAPABILITIES AND FEATURES. . . 1-5
CHAPTER 2 OPERATING INSTRUCTIONS . . . 2-1 SECTION I. PREVENTIVE MAINTENANCE CHECKS AND
SERVIC-ES (PMCS).2-1
2-1. PMCS PROCEDURES. . . 2-1 SECTION II. OPERATION UNDER USUAL CONDITIONS. . . 2-16 2-2. OPERATION OF THE WEAPON. . . . 2-16 2-3. INSTALL MAGAZINE. . . . 2-46 SECTION III. OPERATION UNDER UNUSUAL CONDITIONS.2-46
2-4. ENVIRONMENT/WEATHER. . . 2-46 CHAPTER 3 MAINTENANCE INSTRUCTIONS . . . 3-1 SECTION I. INSPECTION AND LUBRICATION.. . . 3-1 3-1. INSPECTION GUIDE. . . . 3-1 3-2. LUBRICATION GUIDE. . . . 3-2 SECTION II. TROUBLESHOOTING PROCEDURES. . . . 3-13 3-3. TROUBLESHOOTING. . . . 3-13
SECTION III. INSPECTION INSTRUCTIONS.3-41 3-6. REASSEMBLY PROCEDURES
(FROM FIELD STRIP).. . . 3-48 3-7. FUNCTION CHECK. . . . 3-60 CHAPTER 4 MAINTENANCE OF AUXILIARY EQUIPMENT (ACCES-SORIES). . . 4-1 SECTION I. INSPECTION AND LUBRICATION.. . . 4-1 4-1. VERTICAL HANDGRIP. . . 4-1 4-2. RAIL INTERFACE SYSTEM. . . 4-7 4-3. ENHANCED COMBAT OPTICAL SIGHT-NAVY.. . . 4-13 4-4. VISIBLE BRIGHT LIGHT II. . . 4-24 CHAPTER 5 AMMUNITION . . . 5-1 5-1. AMMUNITION. . . 5-1
A-3. SECTION II. BASIC ISSUE ITEMS. . . . A-3 APPENDIX B ADDITIONAL AUTHORIZED LIST . . . B-1 SECTION I. INTRODUCTION. . . B-1 B-1. SCOPE. . . . B-1 B-2. GENERAL. . . B-1 B-3. EXPLANATION OF LISTING. . . . B-2 B-4. EXPLANATION OF COLUMNS. . . . B-2 SECTION II. ADDITIONAL ITEMS LIST. . . . B-4 APPENDIX C EXPENDABLE/DURABLE SUPPLIES AND
MATERI-ALS LIST . . . C-1 SECTION I. INTRODUCTION. . . C-1 C-1. SCOPE. . . . C-1 C-2. EXPLANATION OF COLUMNS. . . . C-1
CHAPTER 1 INTRODUCTION
Figure 1-1. Carbine, 5.56MM MK 18 MOD 0. 1-1. SCOPE.
b. Model number and equipment name: Carbine, 5.56MM MK 18 MOD 0.
c. Purpose of Equipment: The purpose of the carbine is to provide personnel an offensive/defensive capability to engage enemy targets. The MIL-STD-1913 Rails allows the operator the capability to mount vari-ous accessories on the MK 18 Carbine.
1-2. CORROSION, PREVENTION, AND CONTROL (CPC).
CPC of material is a continuing concern. It is important any corrosion issues be reported so that corrections/improvements can be made. While corrosion is typically associated with rusting metals, it can also include
1-3. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDA-TIONS (EIR).
If your carbines or this manual need improvement, let us know. You, as the user, 5.56MM MK 18 MOD 0, are the primary source of information on what needs improvement. Let us know what improvements in design or performance are needed. A reply will be furnished directly to you.
Report to: Commander Crane Division
Naval Surface Warfare Center Attn: Code 4081, Bldg. 2521
300 Highway 361 Crane, Indiana 47522-5001
Section II. Equipment Description.
1-4. EQUIPMENT CHARACTERISTICS, CAPABILITIES AND FEA-TURES.
a. Characteristics.
The 5.56MM MK 18 MOD 0 Carbine is a lightweight air-cooled, gas operated, magazine fed weapon used primarily for semi-automatic fire and automatic fire.
b. Capabilities.
facilitate the mounting of various accessories for tailoring to operational requirements.
c. Features.
The MK 18 MOD 0 consists of a Close Quarter Battle upper Receiver, vertical handgrip, sloping cheek weld buttstock, magazine and compen-sator.
The Close Quarter Battle Receiver (CQBR) is a shortened variant of the M4A1 Carbine upper receiver with a barrel length of 10.3 inches. The CQBR provides the individual soldier operating in close quarters the capability to engage targets with accurate lethal fire.
a. Charging Handle Assem-bly (1).
Provides initial charging of the weapon. The charging handle locks in the forward position dur-ing sustained fire to prevent injury to the operator.
b. Backup Iron Sight (2). Backup iron sight is adjustable for both windage and elevation. c. Bolt and Bolt Carrier
Assembly (3).
Provides stripping, chambering, locking, firing, extraction, and ejection of cartridges using the drive springs and projectile pro-pelling gases for power.
d. Upper Receiver and Bar-rel Assembly (4).
Provides support for the bolt car-rier assembly. The barrel cham-bers the cartridge for firing and directs the projectile.
e. Vertical Grip (5). The vertical handgrip attaches to the rail system and provides added support and control for fir-ing and quicker handlfir-ing with additional components attached to the weapon.
f. Cartridge Magazine (6). Holds cartridges ready for feeding and provides a guide for
position-1-6. EQUIPMENT DATA. g. Lower Receiver and Buttstock Assembly (7).
Provides firing control for the weapon. Provides optional stor-age tubes for basic cleaning materials and/or batteries.
h. Sling Mounts (8) Provides sling to be clipped to the weapon a. Caliber 5.56MM b. Weight W/30 rd (loaded) maga-zine. 7.0 lbs. 10 oz
c. Length.
• Overall Weapon Stock Extended • Length of Barrel Stock Collapsed
30.0 in. 26.75 in. d. Ballistics.
• Muzzle velocity • Chamber pressure • Cyclic Rate of Fire • Fire Selector
2970 fps 52,000 psi
700-970 rpm(approx) SAFE, SEMI, AUTO e. Maximum Effective Rates of Fire.
• Semi • Auto
• Sustained Rate of Fire
45 rpm 90 rpm 12/15 rpm
CHAPTER 2
OPERATING INSTRUCTIONS
Section I. Preventive Maintenance Checks and Services (PMCS). 2-1. PMCS PROCEDURES.
a. General.
To ensure the readiness of your weapon, perform the preventive maintenance procedures in accordance with Table 1 on page 5 to 2-15, prior to each mission. Preventive maintenance procedures include inspection, cleaning, and performance of the checkout procedures.
(1) Item Number Column. Numbers in this column are for refer-ences. When completing Equipment Inspection and Maintenance Work-sheet, include the item number for the check/service indicating a fault. Item numbers also appear in the order that you must do checks and ser-vices for the intervals listed.
(2) Interval Column. This column tells you when you must do the procedure in the procedure column. BEFORE (B) procedures must be done before you operate or use the equipment for its intended mission. DURING (D) procedures must be done during the time you are operating or using the equipment for its intended mission. AFTER (A) procedures must be done immediately after you have operated or used the equip-ment.
pro-(4) Procedure Column. This column gives the procedure you must do to check or service the item listed in the Check/Service column to know if the equipment is ready or available for its intended mission or for operation. You must do the procedure at the time stated in the interval column.
(5) “Equipment Not Ready/Available If:” Column. Information in this column tells you what faults will keep your equipment from being capable of performing its primary mission. If you make check and service procedures that show faults listed in this column, do not operate the equipment. Follow standard operating procedures for maintaining the equipment or reporting equipment failure.
is empty and no ammunition is in position to be cham-bered. Do not keep the ammunition near work area.
NOTE
An inactive weapon is a weapon, whether assigned or not assigned to an individual, that is stored in an arms room for a period of 90 days. Performance of normal cleaning (PMCS) of an inactive weapon will be performed
WARNING
Before starting an inspection be sure to clear the weapon. Do not keep live ammunition near work area. Table 2-1: Preventive Maintenance Checks and Services.
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 1 Before Magazine Magazine slips
easily into the magazine well and locks in place. Magazine is dis-torted or is hard to sear and/or doesn’t lock in magazine well.
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 1 (Cont’d)
Before Magazine
fol-lower has spring tension and moves easily inside of maga-zine. Magazine fol-lower is stuck or has weak spring tension.
2 Before Upper
Receiver-Barrel
Check for barrel looseness (using hand pressure
Barrel is loose enough to be moved by hand. Table 2-1: Preventive Maintenance Checks and Services. (Cont’d)
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 3 Before Weapon Sight (Zero Adjustment)
Move front and rear sight to make sure they can be adjusted. Return sights to zero set-ting on your weapon.
If the sights are damaged, miss-ing, or can’t be adjusted. Table 2-1: Preventive Maintenance Checks and Services. (Cont’d)
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 4 Before Magazine Catch (Func-tion) Insert magazine into well. The magazine catch should hold the magazine in place
If the magazine catch will not retain or release the magazine. Table 2-1: Preventive Maintenance Checks and Services. (Cont’d)
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 4 (Cont’d)
Pressing the mag-azine catch but-ton should release the magazine. To adjust the maga-zine catch, use cleaning rod to press in on the
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 4 (Cont’d)
button until the left side of the maga-zine catch sticks out beyond the receiver. To tighten, turn the magazine catch clockwise; to loosen, turn it
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 5 Before Visual inspection of weapon.
Look the weapon over for missing or damaged parts. Report missing or damaged parts to armorer.
Parts are missing or damaged to a point of being unserviceable. Table 2-1: Preventive Maintenance Checks and Services. (Cont’d)
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 6 During Periodic Inspection of Weapon Periodically check weapon to make sure it’s clean and there is no foreign material in bore. If foreign material is in bore, clean bore. If foreign material is in bore.
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 7 During Maintenance performed during Firing Operations
Clean and lubri-cate weapon after firing approxi-mately 200 rounds of ammunition or at the end of the day.
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 8 After Maintenance of weapon and Equip-ment. Disassemble weapon. Clean and lubricate. Disassemble magazine. Clean and lubricate. Report all dam-aged or missing parts to unit
If parts are miss-ing or damaged. Table 2-1: Preventive Maintenance Checks and Services. (Cont’d)
Item Interval Item to be Checked or Serviced Procedure Equipment not Ready/Available If: 9 Before/ After Perform func-tional check. If weapon fails function check. Table 2-1: Preventive Maintenance Checks and Services. (Cont’d)
Section II. Operation Under Usual Conditions. 2-2. OPERATION OF THE WEAPON.
WARNING
With the bolt carrier assembly locked to the rear or in its forward position. If the weapon is dropped or jarred with a loaded magazine in place, it could chamber a round. a. Use of Selector Lever.
(1) SAFE. Weapon will not fire. Selector Lever cannot be on SAFE unless weapon is cocked. Always place on SAFE when loaded. (2) SEMI. Weapon will fire one round each time the trigger is
(3) AUTO. Weapon will continue to fire as long as the trigger is pulled.
NOTE
Magazine may be inserted into weapon with bolt assem-bly open or closed.
b. Loading for Semi Auto Fire and Chambering a Round.
(1) With hammer cocked placed selector lever on SAFE. Point muzzle in safe direction.
(2) Open bolt and check chamber. Make sure it is clear. Press bottom of bolt catch and allow bolt to move forward until it engages bolt catch. Return charging handle to full forward position.
(3) Push upward until magazine catch engages and
(4) Tap upward to make sure it is seated right.
WARNING
Your weapon is now loaded. Ensure it is pointed in a SAFE direction.
Figure 2-3. Chamber Round from Bolt Closed Position. (7) Chambering a round
from the bolt closed position; with magazine inserted, pull charging handle fully rearward.
(8) Release the charg-ing handle.
Figure 2-4. Tap Forward Assist. CAUTION
Never ‘ride’ the charging handle. Let it go forward on its own.
(9) Tap forward assist to ensure bolt is fully forward and locked.
c. Clearing Weapon.
WARNING
To be considered SAFE before disassembly, cleaning, inspecting, transporting, or storing, the weapon must be
cleared.
(1) Point weapon in a safe direction. Place selector lever on SAFE. If weapon is not cocked, lever cannot be pointed toward SAFE.
Figure 2-5. Remove Cartridge Magazine.
(2) Remove cartridge magazine by depressing magazine catch button and pulling cartridge magazine down.
Figure 2-6. Lock Bolt to Rear.
(3) To lock bolt open, pull charging handle rearward. Press bot-tom of bolt catch and allow bolt to move forward until it engages bolt catch. Return charging handle to full forward position. Ensure to, place selector lever on SAFE.
d. 25 Meter Zero Procedure.
(a) SHORT RANGE OR AT NIGHT - This “larger aperture is used for 0-200 meters range. As shown, the sight is set for 0-200 meters. This larger aper-ture is only used when the rear sight is all the way down. In other words, the 300-meter mark is aligned with the mark on the left side of the receiver.
(b) NORMAL RANGE - The aperture is unmarked and used for most firing situation. it is used in conjunction with the elevation knob for 300, 400, 500, 600-meter targets.
(2) Battlesight Zero. When battlesights are on your weapon. (a) The front sight post and rear sight windage knob are adjusted so you can hit your point of aim at 300 meters.
(b) The unmarked aperture is in the UP position.
(c) The 300 meter mark is aligned with the mark on the left side of the receiver. This will read 6/3.
Figure 2-8. Windage Knob Set at 300 Meters. (3) Battlesight Zeroing Procedures.
(a) During zeroing procedures, only the front sight post and windage knob are adjusted to move the strike of the bullet on the target.
NOTE
FRONT SIGHT - The front sight post is moved up or down when zeroing the weapon. Once the weapon is
zeroed, the front sight post should not be moved.
(c) To adjust elevation, depress detent and rotate post. To raise strike of bullet, rotate post in the direction of arrow marked UP. Reverse the direction of rotation to lower strike of bullet. Each graduation (notch) moves the point of impact of bullet as indicated.
(d) FOR ELEVATION (per click)
(e) FOR WINDAGE KNOB (per click)
IMPACT DISTANCE 1.2 cm (1/2 in.) 25 meters 4.8 cm (1 7/8 in.) 100 meters 9.6 cm (3 3/4 in.) 200 meters IMPACT DISTANCE 0.5 cm (3/16 in.) 25 meters 1.9 cm (3/4 in.) 100 meters 4.8 cm (1 1/2 in.) 200 meters 5.7 cm (2 1/4 in.) 300 meters
(4) Battlesight Zeroing Adjustment. NOTE
To remember your correct battlesight zero windage, note location of windage scale and windage knob pointer
(heavy mark on outside of knob). NOTE
Do not center rear sight aperture for inspections. Keep your correct battlesight zero windage on your weapon at
all times.
NOTE
Do not move front sight post at this time. It was set at the factory or by a previous shooter and should be very close
to your zero. NOTE
Center the rear sight aperture by turning the windage knob left or right. (This is called mechanical zero
wind-age.)
(a) Position a 25 Meter Zero Target, NSN 6920-01-395-2949, 25 meters from the firing line. The carbine target is on one side and the carbine target on the other.
The rear sight should be all the way down on the last whole “click” before it bottoms out. This is called mechanical zero elevation for the rear sight. If your range scale will not line up in the above manner, an armorer will be required to adjust the range scale for you.
(d) The elevation knob should remain aligned on the 300 meter setting. Any further corrections required in elevation are made to the front sight post only.
(e) Aim at target center. Adjust sight and rear windage to move shot group center as close as possible to the white dot in the center of target.
squares are numbered around the edges of the target to equal the num-ber of clicks required to move the shot group to the bull’s eye.
(g) In order to raise your next shot group, rotate the front sight post clockwise. (One click will move the strike of the bullet 1/2 in (1.2 cm.)) In order to lower your next shot group, rotate the front sight post counterclockwise (one click, as above, equals 1/2 in (1.2 cm)). Changes in windage are made with the windage knob. (One click will move the strike of the bullet 3/16 in (0.5 cm)). In order to move the shot group to the left, turn the windage knob counterclockwise. In order to move the shot group to the right, turn the windage knob clockwise.
(h) Carefully aim and fire another group at the center of the target bull’s eye.
Figure 2-11. Allow Bolt to Go Forward.
(6) With selector lever pointing toward SAFE, allow bolt to go for-ward by pressing upper portion of bolt catch.
WARNING
If a noticeable difference in sound or recoil is experi-enced, STOP FIRING. Either condition could indicate an incomplete powder burn and/or a bullet stuck in the bore. Retract bolt slowly and remove fired cartridge case. Clear weapon and check for unburned powder grains in
the receiver or bore and for a bullet stuck in the bore. Remove unburned powder or bullet from bore before resuming firing. If the bullet is stuck in bore, return the
weapon to the armor. (1) Slap upward on magazine to make sure it is properly seated.
WARNING
Do not load with a hot chamber
Figure 2-13. Observe for Ejection of Cartridge or Case. (2) Pull charging handle
all the way back. Observe ejec-tion of case or cartridge. Check chamber for obstruction. If cham-ber is not clear, apply remedial action.
(3) If cartridge or case is ejected or chamber is clear, release charging handle to feed new round. Don’t ride the charg-ing handle forward.
(4) TAP forward assist. (5) Now FIRE. IF it won’t fire, look for trouble and apply remedial action.
f. Remedial Action.
WARNING
If your weapon stops firing with a live round in the cham-ber of a hot barrel, remove the round fast. However, if you cannot remove it within 10 seconds, remove maga-zine and wait 15 minutes with the weapon pointing in a safe direction. This way you won’t get hurt by possible round cooking off. Regardless, keep your face away
(1) If your weapon still fails to fire after performing. Immediate Action. Check again for jammed cartridge case.
(2) If a cartridge case is in the chamber, tap it out with a cleaning rod. Insert the cleaning rod into the muzzle and apply a
g. Bullet Stuck in Bore.
WARNING
If an audible ‘Pop’ or reduced RECOIL is experienced during firing, immediately CEASE FIRE. DO NOT APPLY IMMEDIATE ACTION.
(3) Place the selector lever on the “SAFE” position.
(4) Visually inspect chamber or insert cleaning rod into the bore to ensure there is not a bullet stuck in the bore.
(5) If a bullet is stuck in the weapon, DO NOT attempt to remove it. Turn the weapon into the armorer.
h. Loading the Magazine. NOTE
The magazine may be loaded quickly using ten-round stripper
clips and the magazine filler found in each bandoleer.
(1) With the magazine filler in place, place a ten-round stripper clip in position. Using thumb pressure on the rear of the top cartridge, press down firmly until all ten rounds are below the feed lips of the magazine.
(2) Remove the empty stripper clip while holding the magazine filler in place.
(3) Repeat until three ten round clips are loaded.
(4) Remove magazine filler and retain it for future use.
2-3. INSTALL MAGAZINE.
a. Insert magazine into the magazine well until magazine catch engages and holds magazine.
b. Tap upward to make sure it is seated right.
Section III. Operation Under Unusual Conditions. 2-4. ENVIRONMENT/WEATHER.
Unusual conditions are defined as any climatic condition requiring special maintenance of the weapon. Perform maintenance outlined for the cli-mate that most applies to your operational area.
CAUTION
Be careful not to accidently fire your weapon when insert-ing gloved finsert-ingers into trigger area.
(1) To operate the weapon in extreme cold, depress the trigger guard plunger and open the trigger guard to obtain easy access to the trigger when wearing arctic mittens.
NOTE
Under extreme conditions, a small amount of Cleaner, Lubricant, Preservative (CLP) on moving parts can pre-vent weapon from firing. Ensure CLP is thoroughly removed from weapon and Lubricating Oil, Arctic,
(a) Apply a light coat of LAW to all functional parts. (b) To prevent the condensation of moisture and freezing, keep the weapon covered when moving from a warn to a cold area to allow gradual cooling.
(c) Always attempt to keep the weapon dry.
(d) Unload and hand function the weapon every 30 minutes to help prevent freezing of functional parts.
(e) Do not lay a warm weapon directly in snow or ice. (f) When moving a cold weapon into a warm place, conden-sation (moisture) will form in and on your weapon. If possible, leave your
(g) Keep the insides of magazines and your ammo wiped dry. Moisture will freeze and cause malfunctions. Do not lube the ammo.
(h) The use of the muzzle cap, protective magazine bag, and an overall weapon cover will help protect your weapon. Use them when-ever the tactical situation permits.
(i) For extended operations in extreme cold, have armorer remove trigger guard.
b. Hot, Wet Climate - Jungle. NOTE
(2) Clean and lubricate the weapon more frequently. Inspect hidden surfaces of the bolt and carrier assembly, upper receiver and chamber/barrel extension, and lower receiver and receiver extension for corrosion. Also pay close attention to the spring-loaded detents on the weapon.
(3) To help prevent corrosion, remove handprints with a dry wip-ing rag. Then lubricate lightly with CLP.
(4) Unload and check the inside of the magazine frequently for corrosion and moisture. Wipe ammunition dry before reloading.
(5) Use magazine bag, muzzle cap, etc. for protection when the tactical situation permits.
NOTE
Hot, dry climates are usually areas containing blowing sand and fine dust. Deserts can be hot during daylight
hours and freezing during hours of darkness. Conse-quently, this harsh environment will severely tax your weapon as well as all other types of equipment. Your weapon’s continued operation will depend on your
detailed cleaning and lubricating procedures.
(1) Dust and sand will get into the weapon and magazine. This will cause malfunctions. Give the inside areas and functional parts of the weapon a thorough cleaning every day and after firing missions.
(3) The use of overall weapon protection cover, muzzle cap, and spare magazine protective bags will help protect the weapon and ammo from sand and dust. Use these items when the tactical situation permits.
(4) Keep the bolt and ejection port cover closed, a magazine installed in the weapon, and muzzle cap on the muzzle to help keep out sand and dust.
d. Heavy Rain and Fording Operations - All Climates.
(1) Perform maintenance in accordance with the appropriate cli-mate conditions.
(4) Always drain any water from barrel prior to firing. Dry the bore with a swab and cleaning rod if it is wet.
(5) After Fording:
WARNING
Do not fire if water is present in the barrel. (a) Remove muzzle cap (if applicable).
(b) Point the muzzle down and shake vigorously.
(c) Pull charging handle two to three inches to allow water to drain.
(e) Clear the drain hole in the stock with a pipe cleaner and drain.
(6) After Salt Water Operations.
(a) Clean the rear sight as soon as possible if it has salt water on it.
(b) Wash the rear sight with fresh water if you don’t have time to clean it with CLP.
CHAPTER 3
MAINTENANCE INSTRUCTIONS Section I. Inspection and Lubrication. 3-1. INSPECTION GUIDE.
During and after cleaning the operator should inspect the carbine and its components for any irregularities that may cause problems during its operation. If any potential deficiencies are noted, they should be cor-rected immediately.
• Parts exhibiting signs of cracks, burrs, dents or obvious signs of damage or stress
• Presence of signs or tactile clicks in controls, where applicable • General overall cleanliness
• Presence of proper lubrication
• Movement of gas piston (free movement)
• Presence of corrosion or degradation of surface finish 3-2. LUBRICATION GUIDE.
a. CLP - Cleaner Lubricant Preservative. Use CLP as follows:
(3) Clean your weapon with these patches and rags until they come out clean.
(4) Take a patch or rag and apply a fresh, light coat. NOTE
DO NOT ‘dry clean’ your weapon. DO NOT use hot water or other solvents or you will wash away the Teflon
lubricant that has been building up as a result of your using CLP. If CLP is not used, Rifle Bore Cleaner (RBC)
may be used to remove carbon within the bore. Dry cleaning solvent may be used to completely remove lubricants. For example, when moving to extreme cold
NOTE
Wherever the term CLP or the words lube or lubricant are cited in this Technical Manual (TM), it is to be interpreted to mean that CLP, Lubricant, Small Arms (LSA), or LAW can be utilized as applicable, The following constraints must be adhered to (1) Under all but the coldest arctic conditions, LSA or CLP are the lubricants to use on your
weapon. Either may be used at -10oF or above. How-ever, do not use both on the same weapon at the same
time. (2) LAW is the lubricant to use during cold arctic conditions, +10oF and below. (3) Any of the lubricants may be used from -10oF to +10oF. (4) Do not mix lubri-cants on the same weapon. The weapon must be thor-oughly cleaned during change from one lubricant to another. Dry cleaning solvent (SD) is recommended for
b. Lube Guide.
Under all but the coldest Arctic conditions, CLP or LSA are the lubri-cants to use on your weapon. Remember to remove excessive lubricant from the bore and chamber before firing.
CLP - cleaner, lubricant, and preservative LSA - Weapons lubricant oil, semifluid
BETWEEN 10 F (-12 C) and -10 F (-23 C) use CLP, LSA or LAW. Below -10 F (-23 C) use only LAW.
c. Lubricating Upper Receiver. Lightly lube inside of upper receiver, bore and chamber, outer surfaces of barrel and front sight, and surfaces under handguard. Depress front sight detent and apply one drop lube to front sight detent. Depress several times to work lube into the spring.
d. Lubricate Bolt Carrier Assembly. (1) Place one drop CLP in carrier key.
(2) Generously lubricate outside of these parts. Make certain to get cam pin area, bolt rings, and outside of the bolt body. Put a light coat on extractor and pin.
(3) Lightly lubricate charging handle and inner and outer sur-faces of the bolt carrier. Generously lubricate slide and cam pin area of bolt carrier.
e. Lubricating Lower Receiver Assembly.
Figure 3-4. Lubricating Lower Receiver Assembly. (1) Lightly lubricate inside buffer tube.
f. Lubricate Adjustable Rear Sight. NOTE
Make a note of how far you move the sight so it can be returned to the original position at completion of this task. (1) Use one drop of lube and rotate these parts to ensure lubri-cant is spread evenly above and below:
(a) Elevation knob (b) Elevation screw shaft (c) Windage knob
(f) Aperture (flip up and down)
(2) Elevation Shaft. Also lubricate from inside the upper receiver as follows:
(a) Put two or three drops around the bottom edge of the ele-vation screw shaft and in eleele-vation detent spring hole.
(b) Rotate the elevation dial as far as possible a few times while keeping upper receiver upside down.
g. After Lubing Rear Sight.
(1) Reset your correct zero windage and your battlesight zero. (2) Notice that the rear sight is down when the “3” is aligned with the mark on the left side of the left side of the receiver.
(4) Carry your weapon with the “3” aligned with the mark. (5) Keep the sight on 300 meters to keep dirt and water out of sight mechanism and protect the sight from damage.
Section II. Troubleshooting Procedures. 3-3. TROUBLESHOOTING.
a. Table 3-1 lists the common malfunctions that may occur during the operation or maintenance of the carbine or its components. Perform the tests/inspections and corrective actions in the order listed.
rected by listed corrective actions, forward to the unit armorer for the cor-rective action.
Table 3-1: Troubleshooting Procedures.
MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Failure to Fire. Tap, rack, attempt to fire.
light indentation on the primer.
Notify unit Armorer.
Selector lever on SAFE. Put in fire position. Improper assembly of
fir-ing pin.
Assemble correctly retaining pin goes in back of large shoulder of firing pin.
Defective ammo. Remove and discard. Too much carbon on
fir-ing pin or in firfir-ing pin recess.
Clean.
Bolt Won’t Unlock Dirty or burred bolt. Notify unit Armorer. Won’t Feed Dirty or corroded ammo. Clean.
Dirty magazine. Clean. Defective magazine. Replace. Too many rounds in
magazine.
Take out excess. Table 3-1: Troubleshooting Procedures. (Cont’d)
Magazine not fully seated.
Tap on magazine or adjust magazine catch. Double Feed. Defective magazine. Replace.
Won’t Chamber Dirty or corroded ammu-nition.
Clean or replace. Damaged ammunition. Replace
Carbon in chamber or on gas tube.
Clean. Won’t Lock. Dirt, corrosion, or carbon
buildup in barrel or bolt locking lugs.
Clean lugs. Table 3-1: Troubleshooting Procedures. (Cont’d)
Restricted buffer assem-bly.
Remove and clean. Won’t Extract. Restricted movement of
bolt carrier group.
Remove, clean, and lube. (Before putting bolt back in, make sure gas tube fits into carrier key and that the carrier moves freely.) Dirty or corroded ammo. Remove and clean.
Push out stuck cartridge with cleaning rod. Table 3-1: Troubleshooting Procedures. (Cont’d)
Missing or broken rings. Three rings required.
Notify Armorer. Carbon or dirt in carrier
key or on outside of gas tube.
Clean.
Pipe cleaner stuck inside carrier key.
Notify Armorer. Bolt Fails to Lock
After Last Round.
Dirty or corroded bolt latch.
Clean. Faulty magazine. Replace. Selector Lever Needs oil. Lubricate.
Table 3-1: Troubleshooting Procedures. (Cont’d)
3-4. DISASSEMBLY PROCEDURES (FIELD STRIPPING). WARNING
Keep clear of muzzle Bolt Carrier ‘Hung
Up’
Round jammed between bolt and charging handle and/or double feed.
Remove magazine. Remove rounds, if not removed notify Armorer. CAUTION
If round is removed, bolt is under spring pressure.
Table 3-1: Troubleshooting Procedures. (Cont’d)
a. Clear weapon.
b. Remove the sling assembly. CAUTION
Do not use a screw driver or any other tool when remov-ing the handguards. Doremov-ing so may damage the
hand-guard and/or ship ring.
c. Push takedown pin as far as it will go. Pivot upper receiver from lower receiver.
d. Push receiver pivot pin as far as it will go. e. Separate upper and lower receivers.
g. Remove bolt carrier and bolt. h. Remove charging handle.
i. Remove firing pin retaining pin. Do not spread pin open or close split end of pin.
j. Push in bolt assembly to locked position.
k. Drop firing pin out rear of bolt carrier.
l. Turn cam pin 1/4 turn and lift it out of the Bolt Carrier. Then remove the bolt.
CAUTION
Disassemble using steps m through q only when dirty or damaged.
NOTE
Press rear of extractor to check spring function. Report to Armorer if spring is weak.
m. Push out the extractor pin and remove cartridge extractor and extractor spring as a unit.
p. Fully extend buttstock assembly.
q. Grasp the lock release lever in the area of the retaining nut, pull downward, and slide buttstock to the rear to separate the buttstock assembly from the lower receiver extension.
NOTE
(1) Release base catch.
(3) Jiggle spring and follower to remove. Figure 3-14. Disassemble Magazine.
3-5. CLEANING, INSPECTION, AND REPAIRS. WARNING
Before cleaning be sure to clear the weapon. a. General.
(1) With the weapon disassembled, thoroughly clean, inspect and lubricate.
(2) Always shake CLP before use.
(3) After firing, clean your weapon according to instructions. Wipe dry and lubricate according to lubrication instructions.
b. Bore.
NOTE
The bore of your weapon has lands and grooves called rifling. Rifling makes the bullet spin very fast as it moves
down the bore and down range. Because it twists so quickly, it is difficult to push a new, stiff bore brush through the bore. You will find it easier to pull your bore
brush through the bore. Also, because the brush will clean better if the bristles follow the grooves (called track-ing), you want the bore brush to be allowed to turn as you
pull it through. (1) Attach three rod sections together.
(3) Attach bore brush, don’t reverse direction while in bore. (4) Point muzzle down. Hold receiver in one hand while inserting the end of the rod without the brush into the chamber. Let the rod fall straight through the bore. About 2-3 inches will be sticking out of the muzzle at this point.
(5) Attach the handle section of the cleaning rod to the end of the rod sticking out of the muzzle.
(6) Push the brush through the bore and out the muzzle.
(7) After one pull, take off the handle section and repeat the pro-cess.
the bore brush with the rod tip (patch holder) and a wet patch. Drop it through. You won’t need to attach the handle to pull only a patch through.
c. Upper Receiver. Clean with CLP:
(1) All areas of powder fouling, corrosion, dirt, and rust. (2) Bore and chamber.
(3) Locking lugs. (4) Gas Tube.
Figure 3-15. Cleaning the Chamber. NOTE
Gas tubes will discolor from the heat. Do not attempt to remove discoloration.
Use a bore brush to clean outside surface of protruding gas tube (get sides and bottom from bottom of upper
receiver).
(2) Clean bolt carrier key with worn brush. (3) Clean firing pin hole with pipe cleaner.
NOTE
Use well-worn bore brush only.
(4) Clean carbon deposits and dirt from locking lugs. (5) Clean areas behind bolt ring and under lip of extractor. e. Lower Receiver and Buttstock Assembly.
CAUTION
(2) Use a swab dipped in CLP and cleaning brush to clean pow-der fouling, corrosion, and dirt from outside parts of lower receiver and extension assembly.
(3) Clean buffer assembly, spring, and inside lower receiver and buffer tube with swab dipped in CLP. Wipe dry.
f. Ejector.
(1) Place a few drops of CLP around the ejector to form a pud-dle.
(2) Take a fired or dummy case and place it under the top of the extractor. With a rocking motion, press the case down against the
(3) Replace CLP frequently. Once the spring action of the ejec-tor is smooth and strong, dry off any excess.
g. Clean the magazine.
(1) Remove dirt, grit, or other foreign matter with a clean wiping cloth.
(2) In general a light coating of CLP on all internal magazine component surfaces is best.
(a) In dusty desert conditions, totally wipe parts dry. Adding some powdered graphite may also improve operation of the magazine.
Section III. Inspection Instructions. NOTE
Inspect before lubricating. a. Upper Receiver and Barrel Assembly.
WARNING
Do not interchange bolts between weapons. (1) Inspect rail system (1) for cracks.
(2) Inspect front sight post (2) for straightness and check depres-sion of the front detent.
(5) Inspect charging handle (5) for cracks bends or breaks. (6) Inspect rear sight assembly (6) for the capability to adjust windage and elevation and the spring should retain the short range or long range sight in position.
(7) Inspect gas tube (7) for bends or retention to barrel (installed not shown).
Figure 3-17. Inspect the Upper Receiver and Barrel Assembly. b. Bolt and Bolt Carrier Assembly.
(4) Inspect bolt cam pin area (4) for cracking or chipping.
(5) Inspect locking lugs (5) for cracking or chipping. Inspect bolt face (6) for excessive pitting.
(6) Inspect extractor assembly (7) for missing extractor spring assembly with rubber o-ring and for chipped or broken edges on the lip which engages the cartridge rim.
(7) Inspect firing pin retaining pin (8) to determine if bent or badly worn.
(8) Inspect bolt carrier for loose bolt carrier key (9).
c. Lower Receiver and Buttstock Assembly. (1) Inspect buffer (1) for cracks or damage.
(2) Inspect buffer spring (2) for kinks (installed inside). (3) Inspect buttstock (3) for broken buttplate or cracks. (4) Inspect for bent or broken selector lever (4). (5) Inspect carbine grips (5) for cracks or damage. (6) Inspect for broken or bent trigger (6).
3-6. REASSEMBLY PROCEDURES (FROM FIELD STRIP). a. Assemble the magazine.
c. Insert buffer spring and buffer.
Figure 3-21. Inspect Buffer and Buffer Spring. NOTE
d. Insert the large end of the extractor spring assembly in the extractor and seat it by pushing and turning clockwise.
g. Slide bolt into bolt carrier.
WARNING
Be sure the cam pin is installed in the carrier assembly. If cam pin is not installed, your weapon can still fire and
will explode.
i. Drop in and seat firing pin. j. Pull bolt out.
NOTE
Firing pin should not fall out when bolt carrier assembly is turned upside down.
m. With the bolt extended from the bolt carrier assembly, slide the bolt into the upper receiver.
Figure 3-27. Install Bolt Carrier Assembly.
n. Push charging handle and bolt carrier assembly together into upper receiver until fully seated.
CAUTION
Selector lever must be on SAFE or SEMI before closing upper receiver.
3-7. FUNCTION CHECK.
WARNING
Before starting functional check, be sure to clear the weapon. DO NOT squeeze the trigger until the weapon has been cleared. Inspect the chamber to ensure that it is empty and no ammunition is in position to be
cham-bered.
b. Perform Functional Check.
c. Place selector lever on SAFE: Pull charging handle to rear and release. Pull trigger. Hammer should not fall.
NOTE
Slow is defined as 1/4 to 1/2 the normal rate of bigger release.
d. SEMI: Place selector lever on SEMI-AUTOMATIC. Pull trigger. Hammer should fall. Hold trigger to the rear and charge the weapon. Release the trigger with a slow, smooth motion, until the trigger is fully for-ward. An audible click should be heard. Hammer should not fall. Repeat SEMI posi-tion test five times. Carbine must not malfunc-tion (hammer falls on release of trigger) during any of the five tests.
e. AUTOMATIC: Pull the charging han-dle to the rear, charging the weapon. Squeeze the trigger; hammer should fall. Hold the trigger to the rear and cock the weapon again. Fully release the trigger then squeeze it again. The hammer should not fall because it should have fallen when the bolt was allowed to move forward during the chambering and locking sequences.
CHAPTER 4
MAINTENANCE OF AUXILIARY EQUIPMENT (ACCESSORIES) Section I. Inspection and Lubrication.
4-1. VERTICAL HANDGRIP. a. Installation Procedures.
NOTE
The rail covers will lock only into the end slots of the rails. (1) Detach the rail cover section from the rail on which the (Per
(2) For the carbine, if the vertical handgrip will be installed at the muzzle end of the rail, first install a half length “6 rib” rail cover section so it latches into the end slot.
(3) Unscrew the vertical handgrip lock to the point that the upper tip rests below the slotted surface of the base in the unlocked position.
(4) Slide the vertical handgrip on the desired rail from the muzzle end.
(5) If placed on the lower rail, the vertical handgrip is aligned so it covers the first five slots and the vertical handgrip lock is aligned into the third slot from the end.
NOTE
Assure the top of the vertical handgrip lock is aligned with a rail slot or the top may be dam-aged. In addition, the vertical handgrip may come loose if the top is not aligned properly into
a slot.
(6) With the tip of the vertical handgrip lock centered into the desired recoil slot, while observing through the holes in the side of the vertical handgrip, screw the lock all the way into the grip to the base of the grip lock to aid in later disassembly.
(7) If the vertical handgrip is installed at other locations, experi-ment with rail cover sections of different lengths to protect the rail surface and the shooter’s hand from contact with the metal parts of the rail.
b. Cleaning and Inspection of the Vertical Handgrip.
(1) Clean, inspect and lubricate when the vertical handgrip is installed or repositioned on the tail. At a minimum, clean and inspect weekly. More frequent cleaning may be necessary by operational condi-tions.
(2) For cleaning and inspection, remove the vertical handgrip from the rail. Then unscrew and remove the lock from the base of the vertical handgrip. Clean the lock and base (including the internal threads) as well as the rail surface and recoil slots exposed by the removal of the
NOTE
Care should be taken while stoning on the rails to not alter the dimensions of the slots or rail edges.
(3) Burrs which interfere with attachment or detachment may be removed by an armorer using a stone.
(4) Lightly lubricate the rail surfaces but not the grip itself. The shaft and threads of the vertical handgrip lock are self-lubricating polymer and should not require lubrication.
4-2. RAIL INTERFACE SYSTEM.
handguard slip ring and pivot the upper and lower RIS assemblies off the front handguard retaining cap.
CAUTION
If the upper RIS is removed without first loosening the screw at the muzzle end, components may be damaged.
b. Attachment and Detachment of the Rail Interface System. (1) Handguard sections can be quickly attached and detached from the RIS. A spring latch at one end of each handguard section auto-matically engages cutouts in rail recoil grooves #1 or #15 (depending on its orientation). To slide a handguard section beyond a cutout, or to remove it, slide it in the desired direction while applying thumb pressure to the center of its spring latch.
Figure 4-4. RIS Handguard Sections.
(2) To cover the side and bottom quadrants, install the hand-guard sections from the muzzle end of the RIS. To cover the top quad-rant, install the handguard sections from the rear of the upper receiver group with the carrying handle or sighting system removed.
(used on rails partially occupied by accessories) should be oriented with their spring latches away from the accessories.
(4) Nine handguard sections of various lengths are provided with the RIS. They are:
Four full length (6.15”) sections
Two 3.9” (approximately help length) section One 2.65” (medium short length) section
Two 1.65” (approximately one-third length) sections
For ease of reference, the three shorter lengths can be referred to by the number of ribs along their outer surfaces: “6 rib,” “4 rib,” or “2 rib.” See figure 4-17.
4-3. ENHANCED COMBAT OPTICAL SIGHT-NAVY.
Enhanced Combat Optical Sight-Navy (ECOS-N) is a variable intensity, non-magnifying, day optical sight designed for close combat. It allows very fast target acquisition and engagement at short ranges, while still providing enhanced aiming out to 300 meters as compared to iron sights. The aiming dot is powered by a lithium battery with a manufacturer esti-mated life of 100-1000 hours.
The sight uses a projected red dot collimator, that when zeroed, creates an optical axis that is aligned with the bore and uses reflective coatings on the lens to generate an aiming dot image that appears to be out at the target rather than on the lens. Since this sight is a collimator the dot remains well aligned with the bore no matter from what angle it is viewed
enhances the situational awareness and the speed and ease of acquiring and tracking targets.
a. ECOS-N Installation.
(1) Battery Installation: Remove battery cap and install battery with positive (+) end towards cap. Inspect the O-ring to be sure it is present and not damaged. Failure to do so could result in water leakage into the battery compartment. Reinstall battery cap - hand-tighten only.
ITEM DESCRIPTION
1 Battery Cap, Short
2 Cap, Adjustment (Windage/Elevation) 3 Cap, Rotary Switch
4 Lens Cover, Rear 5 Lens Cover, Front
(2) Installing the ECOS-N on the Mount: Remove the battery cap from the sight. Remove the four allen screws and cover from the mount, then replace with the sight in position and firmly tighten the screws. The windage and elevation adjustments should be to the top and right respectively. Reinstall the battery cap.
(3) Installing the ECOS-N on the Weapon: Ensure the rail and grabber are free of dirt, paint, and burrs to assure a repeatable zero. Position the sight and mount on the rail, then hand tighten plus 1/4 turn the rail grabber knob, figure 4-20. The knob should be to the left of the carbine. Ensure there is space between the bottom front part of the sight and the top of the base/weapon. It is recommended that the sight be placed at the furthest forward position on both the receiver and the rail interface system. Placing the sight too far back will obscure the shooter’s peripheral vision. For the best zero retention, always place the mount into the same slot on the rail.
b. ECOS-N Operation. Zeroing. CAUTION
Do not continue to adjust windage and elevation mecha-nisms if resistance is encountered. This could result in
damage to equipment.
(1) Sight Zero: The ECOS-N is mechanically zeroed at the fac-tory. If the sight is properly installed, only small adjustment should be necessary. The, per click, windage and elevation adjustments are set at 1/2 inch at 100 yards, or 13 millimeters at 100 meters. After initial firing, check to ensure the mount and sight are still secure. After completion of zero turn selector switch to OFF and close lens covers.
the front sight post. Then add eight clicks of adjustment in the up direc-tion to compensate for the addidirec-tional height of the ECOS-N above the front sight post. This method will give satisfactory performance to 100 meters. Beyond 100 meters the sight should be zeroed by live fire.
(3) Point of Aim: The aiming dot in the reflex sight appears to be approximately 4 to 5 minutes of angle. This means that as the range increases, the aiming dot appears to cover a larger portion of the target. See Figure 4-8 for relationship of Range, Aiming DOT, and M855 Projec-tile Trajectory.
(4) Night Operation: The ECOS-N has 10 red dot intensity set-tings. Four of these are suitable for use with night vision devices. The higher settings are visible through the front of the sight and could give away your position.
NOTE
At higher intensity settings the red dot is visible through the front of the sight.
(5) Operation Under Extreme Conditions:
(a) Extreme Heat: No special procedures required. (b) Extreme Cold: Could shorten battery life. Keep extra batteries warm.
(c) Sea Spray, Water, Mud and Snow: Ensure battery cap and two adjustment screw caps are hand tightened before exposure or submersion. Clean lenses as soon as possible after exposure.
(d) Dust and Sand Storms: Keep lens caps closed. (e) High Altitudes: No special procedures required. c. ECOS-N Maintenance.
(1) Care & Cleaning: Clean the lens of dust or salt by rinsing it in fresh water. Shake or blow out excess water and dry the lens with a clean and soft cloth. To avoid scratching the lens, rinse all particles from the lens fully before wiping it with the cloth. The lens should never be
returned to the Program Office and replaced per instructions in Annex A of ST-23-31-1.
(3) Repair Parts List: A list of repair parts is contained in Annex A of ST-23-31-1. All listed parts can be installed at the operator or unit level. Special tools or equipment are not required.
(4) Storage: The ECOS-N is listed in Registry as a serialized item. It should be stored in accordance with applicable service physical security instructions. Remove battery and allow lenses to dry before stor-age. Keep lens caps closed when the sight is not in use.
4-4. VISIBLE BRIGHT LIGHT II.
facili-danger of revealing your position is offset by the need for better vision than is possible with night vision goggles. The bright white light can con-fuse an opponent in CRE and provide momentary advantage. The VBLII operates on three SF123 Lithium Batteries.
a. VBLII Installation.
(1) Install the three 123A Lithium batteries into the body Assem-bly with the + (positive) terminal facing forward (towards the Bezel).
(2) Select the location desired on the weapon for mounting the Pressure Switch. Remove the paper backing from the Velcro “loop” pro-vided in the kit and place Velcro on weapon. Remove the paper backing from the Velcro “hook” and press it in place on the flat side of the Pres-sure Switch. Position the PresPres-sure Switch on the weapon. Route the cable so that it does not interfere with weapon operation.
(3) Hold the Body Assembly against the MIL-STD-1913 Rail on the weapon and tighten the two thumb nuts on the Mount.
b. VBLII Operation.
Apply pressure to the Push Button Switch. The light will come ON. It will stay ON as long as pressure is applied. Turn the Rear Cap clockwise until snug and the light will come ON. The light can be deactivated by unscrewing the Rear Cap Assembly one full turn. This will prevent unin-tentional turn on.
c. VBLII Maintenance. (1) Care and Cleaning.
(a) Clean the VBLII by flushing the outer surfaces with water and wiping with a soft cloth. Such cleaning should be done whenever the VBLII becomes dirty or is exposed to salt water.
(b) To clean the VBLII lens or filters, wipe using a lens tissue or soft cloth with clean water, alcohol, or general purpose window cleaner.
CAUTION
Avoid storing and transporting the VBLII with batteries installed. This reduces the chance of accidental activa-tion and equipment damage due to heat build-up and
bat-tery leakage.
(2) Operator and Organizational Maintenance.
(a) Maintenance is limited to inspection and replacements of repair parts. Units requiring further repairs are to be returned to the
Pro-(b) A list of repair parts is contained in Annex A. All repair parts can be installed at the operator or unit level. Special tools or equip-ment are not required for maintaining the VBLII.
(c) Do not store with batteries installed. (d) Bulb Replacement.
1 If a bulb fails to function, unscrew the reflector bezel and remove the lens/bezel assembly. Remove the old reflector and bulb assembly, and replace with a new assembly.
2 All repair parts can be installed at the operator or unit level without special tools or equipment.
CHAPTER 5 AMMUNITION 5-1. AMMUNITION.
Use only authorized ammunition that is manufactured to US or NATO Specifications.
