Major Components Of Mma Rifle
This task covers:
a. Reassembly b. Test c. Stowage
INITIAL SETUP
References TM 0-1005-249-10
Equipment Conditions
Page 2-16, weapon disassembled into major components.
General Safety Instructions To avoid injury to your eye. use care when removing and installing spring-loaded parts.
Do n^l interchange bolt assemblies or components from one weapon to another. Doing so may result in injury to, or death of, personnel.
Do not keep live ammunition near the work area.
LOCATION
ITEM
ACTION
REMARKS
- Weapon
Lower receiver and extension assembly (1), upper receiver and barrel assembly (2), charging handle assembly (3), bolt carrier assembly (4), small arms sling (5), and cartridge magazine (6)
install
Refer to TM 9-1005-249-10
- M16A1
2 21. MAJOR COMPONENTS OF M16/M16A1 RIFLE vUONT).
LOCATION
ITEM
Function test as follows:
Weapon a. Charging handle assembly b. Selector lever c. Selector lever d. Selector lever
- Weapon
Rifle
ACTION
REMARKS
Pull to rear. Check that chamber is clear. Let bolt and bolt earner close.
Place in SAFE position and pull trigger.
WARNING
Leave hammer in cocked position. Do not pull trigger.
Hammer should not fall.
If the weapon fails the following test continued use of the weapon could result in injury to or death of personnel
NOTE
For the purpose of the following test "SLOW" is defined as 1/4 to 1/2 the normal rate of trigger release.
Place in SEMI position and pull trigger.
Hold trigger to the rear, charge weapon and release the trigger with a slow, smooth motion, without hesitations or stops, until the trigger is fully forward
Repeat the SEMI position test five times, the weapon may not malfunction every time.
Hammer should fall.
Hammer should not fail.
Place in AUTO position. Charge weapon and squeeze trigger.
Hold trigger to the rear, charge weapon, and release trigger. Squeeze trigger.
If the weapon malfunctions during any of these five tests, evacuate it to Direct Support Maintenance for repair.
Hammer should fall.
Hammer should not faH. Automatic sear shou Id have released hammer while holding trigger in the squeezed position before releasing and re-squeezing the trigger.
Prior to stowing the rifle in arms room, perform the fol lowing procedures:
Clear.
Place selector in SEML
Squeeze trigger.
Close ejection port (dust} cover.
Refer to TM 9-1005 249 10.
Hammer should fall.
Place rifle in rack.
2-44 Change 1
CHAPTER 3 DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
- Chapter 3 contains information and instructions to help keep the weapon in good repair. This chapter contains:
a. Repair Parts, Special Tools. TMDE. and Support Equipment b. Service Upon Receipt c. Troubleshooting d. Decontamination of Rifles and Shop Area e. Maintenance Procedures for the.Ml6 and M16A1 Rifle
f. Preembarkation Inspection of Materiel in Units Alerted for Overseas Movement
Section I. REPAIR PARTS, SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT
3-1. COMMON TOOLS AND EQUIPMENT. For authorized common tools and equipment refer to the Modified Table of Organization and Equipment (TOE/ MTOE) applicable to your unit.
3-2. SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT. Special tools required for direct support and general support are listed in appendix C and fabricated tools are listed and illustrated in appendix E.
3-3. REPAIR PARTS. Repair parts are listed and illustrated in appendix C.
Note
Bolt assemblies, and/or barrel assemblies may be interchanged, at the Direct Support Maintenance level, from one rifle to another under the provisions of the note at the bottom of page C-2. If these parts are interchanged, the weapon must be checked/inspected as depicted in paragraphs 3-10, 3-11, and 3-13. While performing these checks/inspections pay special attention lu the head space requirements depicted on page 3-40.
Section II. SERVICE UPON RECEIPT
a. Inspect the weapon for damage incurred during shipment. If the equipment has been damaged, report the damage on SF Form 364, Report of Discrepancy (ROD).
b. Check the weapon against the packing slip to see if the shipment is complete. Report all discrepancies in accordance with the instructions in DA PAM 738750.
c. Check to see whether the equipment has been modified.
d. Check to see if all MWO's have been applied.
Change 2 3-1
3-5. SERVICE UPON RECEIPT OF MATERIEL.
Refer to the following table.
SERVICE UPON RECEIPT - M16 AND M16A1 RIFLE
LOCATION
ITEM
ACTION
REMARKS
M16, M16A1 Rifle
Charging handle
Clear the weapon
Refer to TM 9-1005-249-10
WARNING
To avoid injury to your eye, use care when removing and installing spring-loaded parts.
Bolt carrier assembly and bolt assembly
Ail components
Bolt carrier assembly and bolt assembly
Cartridge magazine
Remove.
Visually inspect for proper assembly, damage, or missing parts.
Clean and lubricate. Reassemble.
Hand function to assure proper operation.
Insert empty magazine and pull the bolt to the rear. Check magazine for positive retention and check functioning of bolt catch by assuring that bolt locks to the rear with empty magazine inserted.
Refer to TM 9-1005-249-10.
Refer to TM 9-1005-249-10.
Refer to TM 9-1005-249-10.
Refer to TM 9-1005-249-10.
See lion III. TROUBLESHOOTING
a. This section contains troubleshooting information for locating and correcting most of the operating troubles which may develop in the 5.56-mm Rifle M16 and M16A1. Each malfunction for the individual component, unit, or system is followed by a list of tests or inspections which will help you to determine the corrective actions to take. You should perform the tests/ inspections and corrective actions in the order listed.
b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a malfunction is not listed or is not corrected by listed corrective actions, see individual repair sections for maintenance instructions on each major assembly.
3-7. TROUBLESHOOTING PROCEDURES.
Refer to troubleshooting table for malfunctions, tests, and corrective actions. The symptom index is provided for a quick reference of symptoms covered in the tabie.
SYMPTOM INDEX
TroubJ es hooting Procedure Page
Bolt fails to lock to rear after firing last round ..................................................3-7
Failure of magazine to lock in weapon ........................................................3-6
Failure to chamber .........................................................................3-6
Failure to cock .............................................................................3-5
Failure to cycle with selector lever set at AUTO ................................................3-8
Failure to eject ....................„........................................................3-5
Failure to extract .........................................................*.................3-5
Failure to feed .............................................................*...............3-6
Faiiure to fire ...............................................................................3-4
Failure to lock..............................................................................3-6
Failure to unlock ...........................................................................3-4
Fires two rounds in SEMI seiector position (doubling) ...........................................3-8
Fires with selector lever on SAFE or when trigger is released with selector lever on SEMI ..........3-0
Short recoil ................................................................................3-7
Weapon cannot be zeroed ..................................................................3-6
TRO UBLESHOOTfNG
MALFUNCTION
TEST OR INSPECTION
corrective action
1. FAILURE TO FIRE.
Replace hammer (1).
Step 2. Weak or broken hammer spring (2).
Replace spring (2).
Step 3. Hammer spring (2) improperly assembled.
Reassemble correctly (p 3-64).
Step 4. Selector lever (3) frozen on SAFE position.
Disassemble and clean.
Step 5. Broken firing pin (4) or firing pin does not meet gage protrusion requirement.
Replace.
2. FAILURE TO UNLOCK.
Step 1. Burred locking lugs (1) on bolt assembly.
Remove burrs.
Step 2. Burred locking lugs (1) on barrel extension
Remove burrs.
Step 3. See short recoil.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. FAILURE TO EXTRACT.
Badly pitted chamber (1).
Replace rifle barrel assembly.
4. FAILURE TO EJECT.
See short recoil.
5. FAILURE TO COCK.
Step 7. Worn or broken trigger nose (1} or trigger spring (2).
Replace trigger (3) or defective trigger spring (2)
Step 2. Worn or broken hammer trigger notch (4).
Replace hammer (5).
Step 3. Worn or broken hammer disconnector hook (9).
Replace hammer (5).
Step 4. Worn or broken hammer automatic sear hook (10)
Replace hammer (5).
Step 5. Worn or broken disconnector hook (6).
Replace disconnector (7).
Step 6. Weak, broken, or missing disconnector spring (8).
Replace spring (8).
Step 7. Worn, broken, or missing automatic sear (11).
Replace automatic sear (11).
Step 8. Weak or broken automatic sear spring (12).
Replace automatic sear (11).
Step 9. Automatic sear spring (12) incorrectly assembled in receiver.
Remove sear (11) and install correctly (p 3-60).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. FAILURE OF MAGAZINE TO LOCK IN WEAPON. Step 1. Dirty or corroded magazine catch (1).
Disassemble and clean.
Step 2. Defective magazine catch spring (2).
Replace spring (2).
Step 3. Worn or broken magazine catch (1).
Replace magazine catch (1).
7. FAILURE TO FEED.
Step 1. Magazine catch spring (1) weak or broken
Replace magazine catch spring (1).
Step 2. Short recoil.
Refer to page 3-7.
8. FAILURE TO CHAMBER.
See short recoil.
NOTE
See new carrier key tool (E-4, app Ej and procedures for its use on page 3-21
9. FAILURE TO LOCK.
Step 1. Damaged bolt carrier key (1).
Repair or replace bolt carrier key (1) and check alinement,
Step 2. Loose screws (2) on bolt carrier key (1)
Disassemble and repair (p 3-19). Reassemble using new screws.
Adjust by bending tube in area of hand guards. Replace gas tube (3) and check alinement.
Sfep 4. See short recoil.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
10. SHORT RECOIL.
Step 1. Improper gap space or worn, missing, or broken bolt rings (1).
Replace bolt rings and stagger gaps.
Adjust by bending in area of hand guards or replace gas tube.
Step 3. Gas tube spring pin (3) missing from front sight (4).
Replace spring pin (3).
Step 4. Partially plugged gas system because of carbon build up in the gas tube (2).
Replace gas tube (2).
Step 5. Carbon buildup in the narrow passage of the bolt carrier key (5).
Clean with CLP (item 5, app D). WARNING
When using P-C-111, avoid skin contact. If it comes in contact with the skin, wash off thoroughly with running water. Using a good lanolin base cream after exposure is helpful. Using rubber gloves is recommended.
Step 6. Carbon buildup in barrel gas port (6).
Remove carbon buildup by soaking in P-C-111 (item 4, app D). Wear rubber gloves (item 10A, app D).
11. BOLT FAILS TO LOCK TO REAR AFTER FIRING LAST ROUND Step 1. Broken bolt catch (1).
Replace bolt catch (1).
Step 2. Weak or broken bolt catch spring (2).
Replace bolt catch spring (2).
Step 3. Restricted movement of bolt catch (1).
Disassemble and clean.
malfunction
TEST OR INSPECTION
CORRECTIVE ACTION
12. WEAPON CANNOT BE ZEROED.
Step 1. Defective rifle barrel assembly (1).
Replace rifle barrel assembly (1).
Step 2. Barrel assembly out of alinement with rear sight on upper receiver.
Aline barrel and upper receiver (p 3-36).
Disassemble, clean, and lubricate.
FAILURE TO CYCLE WITH SELECTOR LEVER SET AT AUTO Step 1. Broken automatic sear (1) or spring (2).
Replace automatic sear (1).
Step 2. Faulty selector lever (3).
Replace selector lever (3).
Step 3. Short recoil.
See malfunction 10.
14. FIRES WITH SELECTOR LFVER ON SAFE OR WHEN TRIGGER IS RELEASED WITH SELECTOR LEVER ON SEMI. Sfep 1. Worn or broken hammer trigger nose (1).
Replace trigger (2).
Step 2. Worn or broken hammer trigger notch (3).
Replace firing hammer (4).
Step 3. Defective selector.
Replace selector (5).
15. FIRES TWO ROUNDS IN SEMI SELECTOR POSITION (DOUBLING). Worn trigger or hammer pin hole. Gage trigger and hammer pin holes.
If oaqe 12006472 enters anv of the four holes, reolace v
Section IV. DECONTAMINATION OF RIFLES AND SHOP AREA
3-8. DECONTAMINATION OF SIGHTS ACTIVATED WITH TRITIUM (H 3). Refer to Chapter 2 for procedures.
TM 9-1005-249-244 P
Section V. MAINTENANCE PROCEDURES FOR THE M16 and M16A1 RiFLE 3-9, MAJOR COMPONENTS OF M16 AND MltiAl RIFLE,
This task covers disassembly-
INITIAL SETUP
Toole.
Small Arms Repairman Tool Kit SC 5180-95-CL-A07 (19204)
Ml6 Series and M231 Firing Port Weapon Direct Support and General Support Maintenance for 5.56-rnm Rifle Tool and Gage Set 8426685 (19204)
References
TM 9-1005-249 10
empty and no ammunition is in position to be chambered- Do not keep live ammunition near work area-
Before starting an inspection on a weapon equipped with a low light level sight, check for damage to the low light level sight- See procedures listed on page 2-14.
Equipment Condition Weapon assembled
General Safety instructions Before starting an inspection, be sure to clear the weapon. Do not actuate the trigger until the rifle has been cleared. Inspect the chamber to ensure that it is location item action remarks
DISASSEMBLY
Weapon
Cartridge magazine (1), small arm's sling (2), bolt carrier assembly (3), charging handle (4), upper receiver and barrel / assembly (5), and lower receiver and extension \ assembly (6)
Remove
Refer to TM 9 1005-249-10
M16A1
3-10 Change 2
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