Corrective Action
4. FAILURE OF SAFETY.
Step 1. Check for worn coil compress helical spring.
Replace worn coil compression helical spring (p 3-22). Step 2. Check for broken grenade launcher safety.
Replace broken grenade launcher safety (p 3-22). Step 3. Check for broken or missing spring pin.
Replace broken or missing spring pin (p 3-22).
5. FAILURE TO CLOSE OR LATCH.
Step 1. Check for worn barrel extension or barrel assembly.
Replace worn barrel extension (p 3-22).
6. FAILURE TO EJECT.
Check for worn, broken, or missing cartridge ejector, spring, or retainer.
Replace worn, broken, or missing parts (p 3-21).
ARMY TM 9-1010-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-010
Section III. DIRECT SUPPORT MAINTENANCE PROCEDURES
3-6. 40MM GRENADE LAUNCHER M203/M203A1 W/E—MAINTENANCE INSTRUCTIONS
This task covers:
Initial installation of the M203 grenade launcher on an M16 series rifle.
INITIAL SETUP
Tools and Special Tools
(Army) Small Arms Repairman Tool Kit (item 5, app B) (MC) Small Arms Repairman Tool Kit (item 5, app B)
Materials/Parts
Locking wire (MS20995C32) (9505-00-293-4208)
Rivet (8448697) (from TM 9-1005-249-23&P, TM 9-1005-319-23&P, or TM 05538C-23&P/2A (Marine
Corps only)) (used to return grenade launcher to the M16 series configuration only) Spring pin (MS39086-41) Swivel locking bar (12598618)
Equipment Condition
Sling and hand guards removed from M16 series rifle (p 2-23).
INSTALLATION OF M203
1. Remove rivet (1) and front swivel (2). Discard rivet (1).
ARMY TM 9-1010-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-010
NOTE
The M16/M16A1 rifle uses the old type swivel mount and swivel locking bar. When one or both parts must be replaced, order new type swivel mount (PN 12598617) and swivel locking bar (PN 12012059). M16A2 can only use the new configuration. M4/M4A1 carbines use swivel locking bar (PN 12991254).
2. Install front swivel (2) and new rivet (3) in swivel mount (4). Flare the rivet (3) with a punch and hammer.
3. Refer to page 2-23 and perform steps 1 thru 14 and return here.
CAUTION
The mounting bracket tang has been lengthened and will require filing for proper fit. Remove only the minimum amount of metal from tip to make sure mounting holes are properly aligned.
4. If screw holes in receiver assembly and mounting bracket (5) cannot be aligned, remove the mounting bracket and file the tip as required.
5. Install bushing half and repeat steps 12 thru 14 on page 2-26.
ARMY TM 9-1010-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-01 0
3-6. 40MM GRENADE LAUNCHER M203/M203A1 W/E—MAINTENANCE INSTRUCTIONS (CONT).
| INSTALLATION OF M203 (CONT).
6. Install two machine screws (6). Fully tighten one machine screw first, and then the other.
7. Check installation of receiver assembly as follows:
a. While holding rifle in a vertical position with the muzzle up, attempt to move the receiver assembly up and down and from side to side.
b. There must be no up and down movement between the receiver assembly (M203) and the rifle barrel.
c. The movement from side to side should not exceed 1/8 inch (0.32 cm) left or right of center. Total movement cannot exceed % inch (0.64 cm).
d. If excess side to side movement exists, replace the bushing halves.
e. If excess up and down movement exists, obtain a new mounting bracket and repeat steps 3 thru 6.
8. Refer to page 2-27 and complete assembly.
RECEIVER ASSEMBLY FIRMLY SEATED
ARMY TM 9-1010-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-010
INSPECTION/REPAIR
INSPECTION/REPAIR
2. Inspect mounting bracket assembly (2) for bends or damage. If damaged, replace/repair. Inspect two socket head screws (3) and washers (4). If damaged, replace.
- INSTALLATION OF M203A1
1. Disassemble quadrant sight (see para 2-13, steps 1 and 2).
2. Disassemble range quadrant (see para 2-14). Dispose/turn-in two excess machine screws.
ARMY TM 9-1010-221-23&P AIR FORCE TO 11W3-9-4-2 MARINE CORPS TM 07700A-23&P/2 NAVY SW 370-AE-MMI-010
INSTALLATION OF M203A1 (CONT)
INSTALLATION OF M203A1 (CONT)
6. Remove sling from front swivel (see para 2-11, step 2).
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