NAVAL SPECIAL WARFARE
SW370-BC-OPI-010
OPERATOR'S MANUAL
FORShotgun, Remington 12-Gauge 870
(NSN 1005-00-999-4213)
June 1996
DISTRIBUTION STATEMENT D: Distribution authorized to DoD and DoD contractors only; due to Specific Authority, (Public Law 90-629-ARMS EXPORT CONTROL ACT AND DoD 5230.25 WITHHOLDING OF); 30 June 1996. Other requests for this document shall be referred to: Commander, Naval Surface Warfare Center (Code 4081), 300 Highway 361, Crane, IN 47522-5001.
DESTRUCTION NOTICE: Destroy by any method that will prevent disclosure of contents or reconstruction of this document.
WARNINGS AND SAFETY PRECAUTIONS
• Always clear the shotgun before starting any procedure described in this manual. Do not squeeze the trigger until the weapon is clear.
• Read this manual completely before handling, loading, or operating the shotgun. • Always assume every weapon is loaded until proven otherwise.
• Always point the shotgun in a safe direction. Do not point the shotgun at anything or anyone you do not want to shoot.
• Do not place your finger on the trigger unless you are ready to fire the weapon and you are certain of your target and the area behind the target.
• Ensure the chamber and bore are free of obstructions before attempting to load or fire the shotgun.
• Use only ammunition authorized in Chapter 4.
• Wear eye protection and protective clothing while disassembling, assembling, or cleaning the shotgun.
• Before reassembling the shotgun after cleaning, look through the barrel from the breech end to ensure the barrel is free of obstructions and excessive lubricants. • Do not pull the trigger or allow the hammer to fall while installing the trigger assembly into the receiver. Personal injury or damage to equipment may result. • Follow the instructions contained within the manual exactly when operating the shotgun.
• Perform detail disassembly only to the level of maintenance required/authorized to identify and correct deficiencies. Always clear the weapon before starting any procedure described in the manual. Do not squeeze the trigger until weapon is clear.
TABLE OF CONTENTS
PAGE
CHAPTER 1 - INTRODUCTION ...1-1
SECTION I - GENERAL INFORMATION...1-1 1-1 Scope ...1-1 SECTION II - WEAPON DESCRIPTION ...1-1 1-2 Nomenclature...1-1 1-3 Major Assembly Groups ...1-3 1-4 Technical Specifications...1-5 SECTION III - TECHNICAL PRINCIPLES OF OPERATION ...1-6 1-5 Principles of Operation ...1-6 1-6 Trigger Group Operation ...1-7
CHAPTER 2 - OPERATING INSTRUCTIONS ...2-1
SECTION I - SERVICE UPON RECEIPT OF MATERIAL ...2-1 2-1 Initial Inspection ...2-1 SECTION II - GENERAL DESCRIPTION ...2-2 2-2 Description...2-2 2-3 Operation and Characteristics ...2-2 2-4 Cycle of Operation ...2-5
2-5 Safety Features ... 2-7 SECTION III - OPERATION UNDER NORMAL CONDITIONS ... 2-8 2-6 Clearing Procedures... 2-8 2-7 Loading and Unloading the Shotgun ... 2-10 2-8 Load Chamber from Magazine ... 2-13 2-9 Readying the Shotgun for Firing ...2-14 2-10 Firing the Shotgun ... 2-14 SECTION IV - OPERATION UNDER UNUSUAL CONDITIONS ...2-15 2-11 Extreme Cold ... 2-15 2-12 Hot, Wet Climates ... 2-15 2-13 Hot, Dry Climates... 2-16 2-14 Heavy Rain and Water Operations ... 2-16 SECTION V - MALFUNCTIONS AND STOPPAGES ...2-17 2-15 Immediate Action ... 2-17 2-16 Remedial Action ... 2-18
CHAPTER 3 - OPERATOR MAINTENANCE ... 3-1
SECTION I - LEVEL OF REPAIR... 3-1 SECTION II - TOOLS AND EQUIPMENT... 3-1 3-1 Operator Tools and Equipment Required ... 3-1 SECTION III - SCHEDULED MAINTENANCE PROCEDURES ... 3-3
3-2 General...3-3 3-3 Field Stripping the Shotgun ...3-4 3-4 Assemble the Shotgun ... 3-10 3-5 Cleaning ... 3-16 3-6 Inspection ... 3-18 3-7 Lubrication ... 3-19 3-8 Safety/Function Check ... 3-22 SECTION IV - TROUBLESHOOTING PROCEDURES... 3-26 3-9 Operator Troubleshooting Procedures ... 3-26 SECTION V - MAINTENANCE PROCEDURES ... 3-29 3-10 Adjustment of Iron Sights ... 3-29
CHAPTER 4 - AMMUNITION ...4-1
4-1 General...4-1
APPENDIX A - REFERENCES... A-1 APPENDIX B - COMPONENTS OF END ITEM AND BASIC ISSUE
ITEMS LIST ... B-1 APPENDIX C - ADDITIONAL AUTHORIZATION LIST (AAL) ...C-1 APPENDIX D - EXPENDABLE AND DURABL E ITEMS LIST ...D-1 APPENDIX E - ACCESSORIES ... E-1 ALPHABETICAL INDEX... Index-1
LIST OF FIGURES
PAGE 1 Right Side View... 1-2 2 Major Assembly Groups ... 1-4 3 Operator Controls and Indicators ... 2-4 4 Remove Barrel ... 3-5 5 Remove Trigger Assembly ... 3-7 6 Remove Fore-End and Bolt ... 3-9 7 Install Trigger Plate Assembly... 3-11 8 Install Breech Bolt and Fore-End Assemblies ... 3-13 9 Install Barrel Assembly ...3-15 10 Lubrication Guide ...3-21 11 12 Gauge Shotgun Cartridge... 4-2
CHAPTER 1 INTRODUCTION
Section I. GENERAL INFORMATION
1-1. SCOPE
Type of Manual: Operator's Manual (Maintenance Manual also available).
Model Number and Equipment Name: Model 870, Remington 12-Gauge Shotgun (NSN 1005-00-999-4213, PN 4870).
Purpose of Equipment: To provide repeating weapon fire for offensive and defensive purposes.
Section II. WEAPON DESCRIPTION
1-3. MAJOR ASSEMBLY GROUPS (See Figure 2)
a. Stock Assembly. The stock assembly is an extension of the receiver assembly and provides a support to shoulder fire the weapon.
b. Barrel Assembly. The barrel assembly houses cartridges for firing. The front sight serves as an aiming device.
c. Trigger Plate Assembly. The trigger plate assembly houses the
components required to provide locking, initial feeding, loading, firing, and safety functions of the weapon.
d. Fore-End Assembly. The fore-end assembly is used to open and close the bolt assembly; permitting loading and firing of the weapon and ejection of the spent cartridge.
e. Bolt Assembly. The bolt assembly feeds and locks the round in the chamber. The firing pin detonates the primer to fire the weapon. The fired round is removed from the chamber by the extractor.
f. Receiver Assembly. The receiver assembly houses the cartridge ejector and serves as support for all major groups and assemblies of the
1-4. TECHNICAL SPECIFICATIONS
Model 870, Remington 12-Gauge Shotgun (PN 4870).
• Gauge of Bore 12 gauge
• Choke Cylinder
• Type of Action Pump
• Type of Firing Mechanism Internal Hammer • Length - Shotgun - Barrel 40.75 in. 21 in. • Weight (approx) 8 lbs (3.6 Kg) • Trigger Pull 3.5 to 8 lbs.
• Type of Magazine Tubular
• Magazine Capacity 4
• Shell 12 gauge
• Ammunition 12 gauge, 2 3/4 in. standard velocity, high
velocity, and 2 3/4 in. magnum shot shells • Navy Ammunition Logistic
Code (NALC)
Lockbuster A024 9 Shot A005 4 Buckshot A020
• Safety Cross bolt type
Section III. TECHNICAL PRINCIPLES OF OPERATION.
1-5. PRINCIPLES OF OPERATION
The operation of the shotgun is completed by pulling the trigger, sliding the fore-end to the rear to open the action, and sliding the fore-end forward again to close the action. The fore-end is mounted on double action bars and fully
controlled by the operator. With the magazine fully loaded and one shell in the barrel chamber locked up, the shotgun is ready to fire.
1-6. TRIGGER GROUP OPERATION
Pulling the trigger rearward moves the disconnector forward to disengage the sear from the hammer. the hammer is driven by the mainspring, rotates, and strikes the firing pin.
CHAPTER 2
OPERATING INSTRUCTIONS
Section I. SERVICE UPON RECEIPT OF MATERIAL
2-1. INITIAL INSPECTION
Upon initial receipt, the shotgun is to be inspected to ensure it was received in proper working order.
STEP ACTION
1 Remove shotgun from container
2 Inspect for damage incurred during shipment 3 Check equipment against packing list
4 Check for missing items 5 Remove packing material
6 Field-strip and inspect for missing, damaged, and rusted or corroded parts
Para 3-3
7 Clean, dry, and lubricate Para 3-5, 3-7
8 Assemble Para 3-4
9 Safety/Function check Para 3-8
Section II. GENERAL DESCRIPTION
2-2. DESCRIPTION
The Remington Model 870, 12-Gauge Shotgun is a manually operated, repeating, magazine fed, shoulder fired weapon.
2-3. OPERATION AND CHARACTERISTICS (See Figure 3)
This paragraph describes the various controls and indicators on the shotgun. a. ACTION BAR LOCK. This lever allows the action to be unlocked without
b. SAFETY. When in the locked "ON" position, the safety prevents the firing of the weapon.
2-4. CYCLE OF OPERATION
Begins with weapon loaded, hammer cocked and safety disengaged.
a. Firing - The cycle begins by pulling the trigger rearward which moves the disconnector forward to disengage the sear from the hammer. The hammer is driven by the mainspring, rotates, and strikes the firing pin.
b. Unlocking - As the fore-end is moved rearward, a lug on the top of the bolt slide engages a camming surface on the bottom of the bolt lock, unlocking the bolt lock from the barrel extension. The bolt then moves
rearward until the bolt slide stops at the back of the receiver. When the front of the bolt lock pivots down, the back of the bolt lock retracts the firing pin and keeps it from moving forward until the bolt is back in the locked position. c. Extraction - The fired cartridge is extracted from the chamber and ejected from the shotgun by pulling the fore-end fully rearward.
d. Ejection - Near the end of the rearward stroke, the shotshell, which is captured between the extractors and the bolt face, strikes the ejector and is pivoted out through the ejection port.
e. Cocking - As the bolt moves to the rear, it cams back the hammer assembly and depresses the disconnector, disengaging it from the sear. When the disconnector is depressed; the sear is able to reengage the sear notch in the hammer after the bolt slide has been moved fully to the rear. When the bolt is returned to the fully locked position, the action bar lock is released by the bolt slide and moves up behind the back end of the bolt slide to block any rearward movement. Simultaneously the disconnector moves up and, if the trigger is released after firing, the disconnector will reengage the sear. This prevents accidental firing when closing the action.
f. Feeding - As the bolt slide nears the end of its rearward movement, it cams the elevator to its lowered position. The bolt slide also cams the cartridge interrupter into position to block the second shell from being
released. Next, the cartridge stop is cammed out of the way by the left hand action bar allowing the shell to be pushed onto the elevator by the magazine follower.
g. Chambering - When the bolt slide moves forward, it cams the elevator up, bringing the shell into alignment with the chamber. As the shell is pushed forward by the bolt into the chamber, it is captured by the extractors. When the bolt nears the limit of its forward travel, the right hand action bar cams the cartridge interrupter down, releasing the next shell to rest against the cartridge stop. The feeding/chambering cycle is now complete.
h. Locking - On the return cycle, as the fore-end is moved forward, the lug on top of the bolt slide contacts the camming surface on the bottom of the bolt lock. When the bolt is moved forward, the top front end of the bolt lock is cammed up, locking into the barrel extension. The new round is now ready to be fired.
2-5. SAFETY FEATURES
A manual safety device has been provided which prevents firing of the shotgun when at the "ON" safe position. The safety button is manually moveable between the safe detent position and the fire detent position and will remain in the position set until reset manually. The user must ensure the safety button is
manually set in the "ON" or "SAFE" position. When the safety is "OFF", a red ring is visible around the safety button, indicating the weapon is fireable.
Section III. OPERATION UNDER NORMAL CONDITIONS
2-6. CLEARING PROCEDURES
a. The Remington shotgun is not considered clear unless: 1. The action is in the open, rearward position.
2. The safety button is in the "ON" position. 3. The chamber is free of brass or ammunition. 4. The magazine tube is free of brass or ammunition.
WARNING
ALWAYS ASSUME EVERY WEAPON IS LOADED UNTIL PROVEN OTHERWISE.
b. To clear the shotgun:
1. Ensure fingers are outside the trigger guard and the shotgun is pointed in a safe direction.
2. Move the safety button to the "ON" position.
3. Push in the action bar lock and slide fore-end back to eject the cartridge from the chamber.
4. Catch the ejected cartridge in your hand. 5. Visually inspect chamber for cartridge.
6. If a cartridge is present on carrier, rotate the shotgun to the right to allow the released cartridge to drop out through the ejection port. 7. Turn the shotgun over so the trigger guard is positioned upward and
8. Insert thumb into the opening in the bottom of the receiver and
depress cartridge stop to release shells one at a time. Repeat until all cartridges are removed from the magazine tube.
9. Depress the action bar lock and pull the fore-end completely rearward. Visually inspect the chamber and magazine tube again to ensure no cartridges remain in the shotgun.
10. Leave the action in the open, rearward position and the safety button in the "ON" position.
CAUTION
IF THE MAGAZINE TUBE CONTAINS AMMUNITION, THIS PROCEDURE WILL CAUSE THE WEAPON TO DOUBLE FEED.
2-7. LOADING AND UNLOADING THE SHOTGUN a. Single Load
2. Depress Action Bar Lock.
3. Pull the fore-end fully to the rear. 4. Place shell into open ejection port.
5. Push fore-end forward to load shell into the chamber. b. Magazine Load
1. Push safety to "ON" position.
2. If action is open, push fore-end completely forward to close action. 3. Turn shotgun over and push shell past carrier into magazine.
4. Ensure rim of cartridge snaps past shell latch. 5. Repeat step 3 until magazine is full.
c. Unloading Shotgun
1. Removing Cartridge from the Chamber. (a) Push safety to "ON" position.
(b) Push in action bar lock and slide fore-end to the rear to eject cartridge from chamber.
(c) Catch the ejected cartridge from chamber. (d) Visually inspect chamber for cartridge.
(e) If a cartridge is present on carrier, rotate shotgun to the right and catch the cartridge as it falls from the ejection port.
2. Remove Cartridge from Magazine. (a) Push safety to "ON" position. (b) Turn shotgun over.
3. Remove cartridges from magazine tube by pressing both right and left shell latches until the magazine tube is clear.
2-8. LOAD CHAMBER FROM MAGAZINE a. Push safety to "ON" position.
b. If gun is cocked, press in on action bar lock. c. Pull the fore-end fully to the rear.
d. Push the fore-end forcefully forward to close the action and feed shell into the chamber.
e. Combat Loading.
1. Single load will operate well assuming the magazine contains no ammunition; otherwise two rounds will be in the receiver. This could be used if combat loading is authorized by your Command.
2-9. READYING THE SHOTGUN FOR FIRING
a. Point shotgun down range in a safe direction.
b. Push safety into "OFF" position. When the safety is "OFF", a red ring will be visible around the safety button.
WARNING
1. BE SURE OF YOUR TARGET AND WHAT IS BEHIND IT. 2. ENSURE ALL PARTS OF THE BODY ARE KEPT AWAY FROM THE
MUZZLE OF THE WEAPON AT ALL TIMES.
3. ALWAYS WEAR EYE AND EAR PROTECTION WHEN POSSIBLE WHEN FIRING THE SHOTGUN.
2-10. FIRING THE SHOTGUN
a. Aim and fire shotgun by pulling the trigger.
b. Pull the fore-end fully to the rear; push the fore-end forcefully forward to close action and feed shell into chamber.
c. To continue firing, repeat steps a and b.
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
2-11. EXTREME COLD
NOTE
If the shotguns are exposed to temperature changes quickly from warm to cold, condensation may form, causing rusted parts.
a. If shotguns are exposed to conditions that cause condensation, wipe condensation from exposed metal surface.
b. Lubricate the shotgun. 2-12. HOT, WET CLIMATES
a. Inspect shotgun frequently for rust. b. Lightly oil metal parts.
2-13. HOT, DRY CLIMATES
a. Clean shotgun daily or as required.
b. In sandy or dusty areas, wipe shotgun free of oil to prevent sand and dust from collecting on the surface and on moving parts.
2-14. HEAVY RAIN AND WATER OPERATIONS a. Drain water out of shotgun.
b. Unload shotgun.
c. Field strip, wipe, and dry shotgun as soon as possible. d. Clean and lubricate weapon.
Section V. MALFUNCTIONS AND STOPPAGES
2-15. IMMEDIATE ACTION
Immediate action is the action performed immediately by the firer any time there is an unscheduled or unanticipated interruption of the shotgun operation. Immediate action should be practiced to the point that it occurs as a reflex action.
a. Pull the fore-end rearward. b. Check the ejection port.
c. If a cartridge case is ejected, push the fore-end forward and attempt to fire again.
2-16. REMEDIAL ACTION
Remedial action is the action performed to remedy a problem and place the shotgun back into operation after immediate action has been performed and proves ineffective.
To perform remedial action: a. Clear the shotgun.
b. Check the chamber for and remove any type of obstruction caused by an empty or ruptured case, live rounds or foreign matter.
c. Reload magazine tube. d. Chamber a new cartridge. e. Attempt to fire the weapon.
CHAPTER 3
OPERATOR MAINTENANCE
Section I. LEVEL OF REPAIR
This operator manual addresses the functions which the operator os
authorized to perform. Any additional tasks require the weapon to be returned to the armorer for repair.
The round count for turn in to NSWC Crane for the Remington 12-Gauge Shotgun is 15,000 rounds.
Section II. TOOLS AND EQUIPMENT
3-1. OPERATOR TOOLS AND EQUIPMENT REQUIRED
As a minimum, you will require the following materials to clean the Remington 12-Gauge Shotgun.
MATERIALS: TOOLS:
1. [0172] Brush, paint 1. [0614] Hammer, hand, Soft head, 2. [0366] Detergent, general 1/2 LB, copper
purpose, MIL-D-16791 2. [Punch, drive pin 1/16" 3. [0766] Linseed oil, raw,
TT-L-215
4. [0831] Lubricating oil, general MISCELLANEOUS: purpose, VV-L-800, SYM PL - S 1. [2000] MRC(s) (M-1)
5. [1102] Rags, wiping 2. [3109] Rod, cleaning, small arms 6. [1338] Swab, small arms cleaning. 3. Cleaning compound, simple green 7. [2057] Cleaner, lubricant and NSN:24 oz 7930-01-342-5315
preservative, MIL-L-63460 1 gal 7930-01-306-8369
8. Armorer Stone Set 5 gal 7930-01-342-5316
9. [2274] Pail, utility 4. Cleaning machine, mini-max 10. [2376] Water, fresh, No NSN
W/C provide
NOTE
Numbers in brackets can be referenced to Standard PMS Materials Identification Guide (SPMIG) for stock number identification.
Section III. SCHEDULED MAINTENANCE PROCEDURES
3-2. GENERAL
This section lists those required checks and services to be performed by personnel who operate the Remington 12-gauge shotgun. This section includes services required to prepare the shotgun for operation, to check the shotgun during operation, and to ensure proper function after maintenance. Before performing any scheduled maintenance, ensure the shotgun log book has been updated with the correct round count and any scheduled maintenance
documented. If your equipment fails to operate, refer to the Troubleshooting Tables in Chapter 3, Section IV.
WARNING
BEFORE STARTING AN INSPECTION PROCEDURE CLEAR THE WEAPON! INSPECT THE CHAMBER TO ENSURE IT IS EMPTY. DO NOT KEEP LIVE
AMMUNITION NEAR MAINTENANCE/WORK AREAS. ALWAYS ASSUME EVERY WEAPON IS LOADED UNTIL PROVEN OTHERWISE.
NOTE
Before starting any scheduled maintenance ensure the shotgun log book has been updated with the correct round count and any scheduled
maintenance documented.
3-3. FIELD STRIPPING THE SHOTGUN a. Remove Barrel. (See Figure 4)
1. Clear the shotgun.
2. Remove magazine tube cap from magazine tube and pull the fore-end halfway to the rear.
b. Remove Trigger Assembly. (See Figure 5) 1. Push safety to "ON" position.
2. Slide fore-end assembly to the rear.
3. Remove rear trigger pin and front trigger pin from receiver. 4. Position shotgun with trigger guard upward.
5. Lift rear of trigger plate assembly, then slide it to the rear to remove from receiver.
c. Remove Fore-End Group and Breech Bolt Group. (See Figure 6) 1. Depress the front of the left shell latch and slide the fore-end
assembly forward off the magazine tube. 2. Lift breech bolt from action bars.
3-4. ASSEMBLE THE SHOTGUN
a. Trigger Plate Assembly. (See Figure 7)
1. Ensure hammer is cocked and safety is in the "ON" position.
2. Adjust shell latches until the holes for the front and rear trigger plate pins are aligned, if necessary.
3. Insert the trigger plate assembly into the bottom side of the receiver. Tilt trigger plate assembly clockwise to clear action bar lock. Adjust until trigger plate is aligned in opening.
4. Push downward on rear of trigger plate until it enters receiver freely. DO NOT FORCE.
b. Install Breech Bolt and Fore-End Assemblies. (See Figure 8)
1. Position breech bolt and slide assembly on ends of action bars. Extractor should face forward and slide assembly should be engaged by grooves in top rear of the action bars.
2. Slide fore-end and breech bolt assembly over magazine tube. Insert end of action bars into matching receiver grooves. Carrier assembly should be in down position. Move fore-end assembly rearward until contact is made with front end of right shell latch. 3. Press front of right shell latch into side of receiver. Move fore-end
assembly past right shell latch until contact is made with left shell latch.
4. Press front of left shell latch into side of receiver. Move fore-end assembly past left shell latch until contact is made with action bar lock.
c. Install Barrel Assembly. (See Figure 9)
1. Place barrel with barrel guide ring over the magazine tube. 2. Seat barrel firmly into receiver.
3. Screw magazine cap onto magazine tube and draw tight. 4. This completes assembly of the shotgun.
3-5. CLEANING
a. Normal Cleaning. Normal cleaning is performed after each firing, or every four (4) months, or after any exposure to extreme environmental conditions such as salt, fog, sand, mud, water, etc.
b. Clean the Barrel Bore
1. Dip the bore cleaning brush in bore cleaning solution and brush the chamber and bore from the chamber end of the barrel.
2. Pull the brush through the chamber and bore.
3. Continue brushing until the chamber and bore are well covered with solution.
c. Clean Barrel Assembly and Bolt Assembly
1. Use the bore cleaning brush with bore cleaning solution and clean all carbon and powder residue from the extractor and bolt face.
2. Also carefully clean under the hooks of the extractors. d. Other Metal Surfaces
1. Using a fiber or nylon brush and solvent cleaning solution, clean the remaining surfaces on all metal parts.
2. Wipe all metal parts of the shotgun with clean, dry, cotton wiping rags, pipe cleaners, or cleansing patches.
3. When wiping out the barrel chamber and bore, use a new patch inserted on the cleaning rod for each pass through the barrel. 4. Continue this process until a patch comes out of the barrel clean
3-6. INSPECTION
During and after cleaning the operator should inspect the shotgun and its components for any irregularities that may cause problems during its operation. If any potential deficiencies are noted, they should be corrected immediately and/or brought to the attention of the unit armorer.
a. Visually Inspect the Shotgun for: 1. Damaged or missing parts. 2. Improper assembly or function.
3. Absence of free movement, where applicable. 4. Absence of spring tension, where applicable. 5. Uncustomary looseness.
6. Parts exhibiting signs of cracks, burrs, dents or obvious signs of damage or stress.
7. Presence of stops or tactile clicks in controls, where applicable. 8. General overall cleanliness.
9. Presence of proper lubrication.
10. Presence of corrosion or degradation of surface finish. 3-7. LUBRICATION
a. Immediately after firing the shotgun, clean receiver chamber, firing pin well on bolt assembly and any other powder-fouled surfaces with rifle bore cleaner (RBC).
b. Field strip shotgun.
c. Clean components with cleaner lubricant preservative, (CLP). d. Wipe par ts dry and lubricate with CLP.
e. Wipe wooden components with a slightly oiled wiping rag. Remove surplus oil with dry wiping rag.
f. Reassemble shotgun.
CAUTION
NEARLY VISIBLE FINGERPRINTS ON THE BARREL AND RECEIVER ASSEMBLIES CAN CAUSE RUST UNLESS REMOVED.
g. Wipe the shotgun with a light coat of CLP to prevent rust. h. Thereafter, clean and lubricate shotgun every 90 days, unless
CLP - Cleaner, lubricant, and preservative
(above -10°F)
LAW - Weapons lubricating oil, arctic (below -10°F)
Between +10 and -10°F
(-12 and -23°C), use CLP or LAW as conditions permit.
3-8. SAFETY/FUNCTION CHECK
a. A safety/function check should be performed anytime the shotgun is reassembled. This quick check indicates whether or not the shotgun is properly assembled and with all components. A properly executed safety/function check can also reveal many of the more obvious
malfunctions that could occur between the interactive components of the shotgun.
b. Safety. The safety shall be movable manually between the safe position and the fire position, and it shall remain in the position set until reset manually. The actuating force required to operate the safety is 3 pounds minimum to 6 pounds maximum. With the safety in the safety position attempt to fire the weapon by pulling the trigger several times. The trigger shall not move perceptibly. After the trigger has been released move the safety to the fire position. The weapon shall not fire until the trigger is pulled. The operation of the safety shall not change the weight of trigger pull.
c. Trigger Pull. The trigger pull shall be checked before and after checking the safety for proper operation. Trigger pull shall not be less than 3.5 pounds or greater than 8 pounds.
d. Slide and Breech Bolt Action. When the fore-end is pulled rearward, it shall cause the breech bolt to open for extraction and ejection of the fired shell. When the fore-end is returned to the forward position, it shall cause the breech bolt to chamber the next round and lock in the battery position. The fore-end shall move the bolt through its full range of travel without binding. When the breech bolt is in the battery position, the fore-end shall not be capable of being moved rearward by manual operation without firing the weapon or depressing the action bar lock. After the trigger has been pulled, the fore-end shall be capable of being pulled rearward without operating the action bar lock. The shotgun shall not fire when the fore-end is slammed smartly into battery position with the trigger depressed. It shall not be possible to actuate the firing
mechanism until the breech bolt is in the locked position and the trigger has been released and repulled.
e. Barrel and Receiver Assembly. When the barrel is assembled to the receiver and magazine cap is tightened there shall be no perceptible movement between the barrel and receiver.
f. Headspace. Headspace is defined as the distance from the face of the breech bolt in firing position to the surface in the chamber on which the cartridge case stops. Measure headspace with adjustable gage
#7314899. When the bolt is locked in the firing position, the headspace should be from 0.0576 inch minimum to 0.0716 inch maximum or a gage reading of 8 minimum to 22 maximum in all shotguns. Check headspace as described below: after assuring ther e are no live cartridges in barrel, chamber, magazine or work area.
NOTE
Clean the barrel, chamber and face of bolt. Assure there are no burrs on the bolt face or a raised edge around the firing pin hole. Set the
headspace gage such that the measured headspace is 0.0575 inches or a gage setting of 8. Insert gage in chamber and attempt to fire. Gun should fire. Remove gage and set headspace gage such that the measure reading of 0.716 inch or a gage setting of 22. Attempt to fire gun with gage in chamber. Gun should not fire.
NOTE
If receiver is unserviceable or proper headspace cannot be obtained by selective assembly of breech bolt or barrel, reject the weapon.
g. Magazine Assembly. The magazine shall be capable of holding 4 cartridges without sticking or binding. Cartridges shall be securely
retained by the shell latches. When the fore-end is cycled, one cartridge shall feed freely onto the carrier assembly. Double feeding is not
acceptable.
h. Butt Stock Assembly. When the butt stock is assembled to the receiver and tightened, there shall be no perceptible movement between the stock and receiver.
i. Sling Swivels. There shall be no perceptible movement of the butt stock swivel after assembly, and the front swivel shall swivel freely.
j. Buttplate or Recoil Pad. The stock of the shotgun shall be equipped with either a recoil pad or a buttplate which shall be fastened securely to the stock and shall match the contour of the stock within .015 inch. The screws attaching the recoil pad shall bottom securely on the steel plate of the pad. The screws for attaching the buttplate shall be flush to 1/16 inch below the surface of the plate.
Section IV. TROUBLESHOOTING PROCEDURES
3-9. OPERATOR TROUBLESHOOTING PROCEDURES
MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION
1. Shotgun will not fire.
Step 1. Check position of safety.
Move safety to "OFF" position.
Step 2. Check shotgun for ammunition.
MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION
Step 3. Check for cartridge in chamber.
Pump cartridge into chamber.
Step 4. Check for defective ammunition.
Remove defective cartridge and use new ammunition. Step 5. Check for obstruction
on firing pin well on bolt assembly.
Clean firing pin well with a wiping rag dampened with CLP.
Step 6. Check firing pin and extractors for burrs, excessive wear, and breakage.
Notify armorer.
Step 7. Check to see if bolt assembly will slide forward by pushing fore-end forward.
If fore-end will not slide forward, notify next higher level of maintenance.
MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION
2. Shotgun fails to load or feed.
Step 1. Check for obstruction in the chamber.
Remove obstruction from chamber.
Step 2. Check for foreign matter in the
magazine tube and in the left and right slide arm supports of the action slide.
Remove foreign matter.
Step 3. Check the action slide for proper functioning.
If action slide is defective, notify next higher level of maintenance.
3. Operation is sluggish.
Check for dirt, carbon, burrs, and lack of lubrication.
Clean and lubricate shotgun.
Section V. MAINTENANCE PROCEDURES
3-10. ADJUSTMENT OF IRON SIGHTS Not applicable to the shotgun.
CHAPTER 4 AMMUNITION
WARNING
USE ONLY 12-GAUGE 2.75 INCH AMMUNITION IN THE REMINGTON 12-GAUGE SHOTGUN THAT IS AUTHORIZED BY YOUR COMMAND.
4-1. GENERAL
The ammunition for the shotguns is classified as small arms ammunition and is issued in the form of a complete round. The cartridge consists of the lead pellets (00 buckshot), NALC A011 cartridge case (which is waterproofed),
wadding, propellant powder, and primer necessary to fire the weapon. Refer to Figure 11 for shotgun cartridge description. (Other types of 12-gauge ammunition are #4 Buckshot, NALC A020, #9 Shot, NALC A005 and lockbuster, NALC A024.)
APPENDIX A REFERENCES
A-1. SCOPE
This appendix lists all forms, field manuals and technical manual referenced in this manual.
FORMS OPNAV 4790 and approved forms and records
MANUALS
SW -370-AD-MMI-010 Direct Support Maintenance Manual for 12 gauge Remington Model 870 Shotgun SW370-AP-MMO-010 Maintenance Manual, Shotgun 12 gauge
Remington 870
Maintenance Plan, Shotgun 12 gauge Remington 870
NAVSEA
SW010-AD-GTP-010
APPENDIX B
COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS LIST
Section I. INTRODUCTION
B-1. SCOPE
This appendix lists components of the end item and basic issue items for the shotgun to help you inventory the items for safe and efficient operation of the equipment.
B-2. GENERAL
The Components of End Item (COEI) and Basic Issue Items (BII) Lists are divided into the following sections:
a. Section II, Components of End Item. This listing is for information purposes only, and is not authority to requisition replacements. These items are part of the shotgun. As part of the end item, these items must be with the end item whenever it is issued or transferred between
property accounts. Items of COEI are removed and separately packaged for transportation or shipment only when necessary. Illustrations are furnished to help you find and identify the items. b. Section III, Basic Issue Items. These essential items are required to
place the shotgun in operation, operate it, and to do emergency repairs. Although shipped separately packaged, BII must be with the shotgun during operation and when it is transferred between property accounts. This list is your authority to request/requisition them for replacement based on authorization of the end item. Illustrations are furnished to help you find and identify the items.
B-3. EXPLANATION OF COLUMNS
a. Column (1) - Illustration Number. Gives you the number of the item illustrated.
b. Column (2) - National Stock Number. Identifies the stock number of the item to be used for requisitioning purposes.
c. Column (3) - Description and Usable On Code. Identifies the Federal item name followed by a minimum description when needed. The last line below the description is the Contractor and Government Entity Code (CAGEC) and the part number.
d. Column (4) - U/I (Unit of Issue). Indicates how the item is issued for the National Stock Number shown in Column (2).
e. Column (5) - Qty Rqd. Indicates the quantity required.
Section II. COMPONENTS OF END ITEM
(1) ILLUS NO. (2) NATIONAL STOCK NUMBER (3) DESCRIPTION (4) U/M (5) QTY RQR 1 1005-00-630-1446 CLEANING ROD (19204) 6301446 EA 1
2 1005-01-216-4510 SLING, SMALL ARMS (19204) 12624561
EA 1
3 BRUSH, BORE CLEANING EA 1
APPENDIX C
ADDITIONAL AUTHORIZATION LIST (AAL)
Section I. INTRODUCTION
C-1. SCOPE
This appendix lists additional items that you are authorized for the support of the shotgun.
C-2. GENERAL
This list identifies items that do not have to accompany the shotgun and that do not have to be turned in with it.
C-3. EXPLANATION OF LISTING
National stock numbers, description, and quantities are provided to help you identify and request the additional items you require to support this
equipment.
Section II. ADDITIONAL AUTHORIZATION LIST.
(1) NATIONAL STOCK NUMBER (2) DESCRIPTION CAGE & PART NUMBER
(3) U/M (4) QTY RECM 8415-00-261-6944 CASE (81349) MIL-C-1690 EA 1
APPENDIX D
EXPENDABLE AND DURABLE ITEMS LIST
Section I. INTRODUCTION
D-1. SCOPE
This appendix lists expendable and durable items that you will need to operate or maintain this shotgun. This listing is for information only and is not authorized to requisition the listed items.
D-2. EXPLANATION OF COLUMNS
a. Column (1) - Item Number. This number is assigned to the entry in the listing.
b. Column (2) - Level. This column identifies the lowest level of maintenance that requires the item.
c. Column (3) - National Stock Number. This is the National Stock Number assigned to the item which you can use to requisition it.
d. Column (4) - Item Name, Description, Contractor and Government Entity Code (CAGE), and Part Number. This provides the other information you need to identify the item.
e. Column (5) - Unit of Measure (U/M). This code shows the physical measurement or count of the item, such as gallon, dozen, gross, etc.
Section II. EXPENDABLE/DURABLE SUPPLIES AND REQUIREMENTS LIST. (1) ITEM NO. (2) LEVEL (3) NATIONAL STOCK NUMBER (4) CAGE PART NO. (5) U/M
1 Oper. Cleaner, Lubricant,
Preservative (CLP) (81349) MIL-L-63460
Oper. 9150-01-079-6124 4 oz bottle OZ
Oper. 9150-01-054-6453 1 pt bottle PT
Oper. 9150-01-053-6688 1 gal can GL
2 Cleaning Compound, Rifle Bore
(RBC): Solution Type (81349) MIL-C-372
Oper. 6850-00-224-6657 8 oz can OZ
(1) ITEM NO. (2) LEVEL (3) NATIONAL STOCK NUMBER (4) CAGE PART NO. (5) U/M 3 Oper. 6850-00-281-1985 Dry Cleaning Solvent (SD)
(58536) A-A-711 1 gal can
GL
4 Oper. 9150-00-292-9689 Lubricating Oil, Weapons, Arctic (LAW)
(81349) MIL-L-14107
CN
5 Lubricating Oil, Weapons,
Semifluid (LSA)
Oper. 9150-00-935-6597 2 oz bottle (81349) MIL-L-46000
OZ
Oper. 9150-00-889-3522 4 oz bottle (19204) 8436793 OZ 6 Oper. 7920-00-205-1711 Rag, Wiping (58536) A-A-2522
50 lb bale
(1) ITEM NO. (2) LEVEL (3) NATIONAL STOCK NUMBER (4) CAGE PART NO. (5) U/M 7 Oper. 1005-00-288-3565 Swab (19204) 5019316 EA
Oper. Cleaning Compound, Simple
Green (1Z575)
Oper. 7930-01-342-5315 24 oz bottle OZ
Oper. 7930-01-306-8369 1 gal GL
APPENDIX E ACCESSORIES
The following accessories are items authorized for use in changing the Remington 12-Gauge Shotgun configuration at the operator level. Any other configuration changes are not authorized without prior approval of
COMNAVSPECWARCOM.
Item Tactical Light
ALPHABETICAL INDEX
SUBJECT PAGE
A
Accessories... E-1 Additional Authorization List... C-1 Adjustment of Iron Sights... 3-29 Ammunition ...4-1 Assemble the Shotgun ... 3-10
C
Cleaning... 3-16 Clearing Procedures ...2-8 Components of End Item (COEI) and Basic Issue Items (BII) ... B-1 Cycle of Operation ...2-5
D
Description ... 2-2
E
Expendable and Durable Items List... D-1 Extreme Cold ... 2-15
F
Firing the Shotgun ...2-14
G
General ... 4-1 General Description ... 2-2 General Information ... 1-1
H
Heavy Rain and Water Operations ... 2-16 Hot, Dry Climates... 2-16 Hot, Wet Climates ... 2-15
I Immediate Action ... 2-17 Initial Inspection...2-1 Inspection... 3-18 Introduction ...1-1 L Level of Repair ...3-1 Load Chamber from Magazine ... 2-13 Loading and Unloading the Shotgun... 2-10 Lubrication ... 3-19
Maintenance Procedures... 3-29 Major Assembly Groups ... 1-3 Malfunctions and Stoppages ...2-17
N
Nomenclature ... 1-1
O
Operating Instructions ... 2-1 Operation and Characteristics... 2-2 Operation Under Normal Conditions... 2-8 Operation Under Unusual Conditions ...2-15 Operator Maintenance ... 3-1 Operator Tools and Equipment Required... 3-1 Operator Troubleshooting Procedures...3-26
Principles of Operation ...1-6
R
Readying the Shotgun for Firing ... 2-14 References... A-1 Remedial Action ... 2-18
S
Safety Features ...2-7 Safety/Function Checks... 3-22 Scheduled Maintenance Procedures ...3-3 Scope ...1-1 Service Upon Receipt of Material ...2-1
T
Technical Principles of Operation... 1-6 Technical Specifications... 1-5 Tools and Equipment ... 3-1 Trigger Group Operation ... 1-7 Troubleshooting Procedures...3-26
W
