Installation Of Ma Cont

M203 40mm Grenade Launcher

11. Stake once on each side of barrel stop pin hole (5).

11.1. Position mounting bracket over carbine barrel in step down area between muzzle and front sight with the flanges toward the muzzle.

12. Rotate mounting bracket upward/side ways and insert other bushing half between M203A1 receiver and M4/M4A1 carbine barrel.

13. Insert bracket clamp assembly (6) into mounting bracket (7) behind the mounting bracket flange, with the rounded portion of bracket clamp assembly toward carbine barrel, and slide the bracket clamp assembly in until the bracket clamp assembly tabs hook underneath the mounting bracket flange.

14. Lift up on bracket clamp assembly to avoid binding and align screw holes in receiver assembly and mounting bracket. Install two washers, two socket head screws and tighten snug by hand.

15. Screw in the bracket clamp assembly screw (8) until the bracket clamp (6) is snug against the mounting bracket flange, then tighten the bracket clamp assembly screw an additional % turn. DO NOT OVER TIGHTEN.

16. Fully tighten the two screws on the side of the receiver.

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

17. Check installation of the M203A1 receiver assembly as follows.

a. The movement from side to side should not exceed 1/8 inch left or right of center. Total movement cannot exceed % inch.

b. If excess side to side movement exist, replace the bushing halves.

c. Check forward and rearward movement of M203A1 receiver. No forward or backward movement is allowed.

18. Engage trigger guard (para 2-11, step 16).

19. Install locking wire:

a. Install an 8 inch (20.32 cm) length of locking wire; it may be started at either socket head screw.

b. Insert locking wire approximately halfway through hole in head of socket head screw.

c. Wrap the half of the wire farthest from the front of the receiver assembly around the head of the mounting screw in a clockwise direction.

d. Twist wire strands together in either right-hand or left-hand direction. Begin at the socket head screw until the twisted wire reaches an appropriate hole in the bracket clamp assembly screw. Insert locking wire through one of the bracket clamp assembly screw holes.

e. Twist wire in same direction used in step "a" until one strand of wire can be inserted through socket head screw on other side of receiver and pull wire tight.

f. Wrap loose strand of wire around head of socket head screw in a counter clock wise direction.

g. Twist wire strands together, beginning at the screw head, until the twisted wire is approximately 1/2 inch (1.27 cm) long.

h. Cut off excess wire strands and bend twisted section out of the way.

20. Install M203 barrel (see para 2-11, steps 20 and 21).

21. Install new handguard and sight assembly (see para 2-11, step 22).

22. Install sling in front swivel (see para 2-11, step 23).

23. Install quadrant sight assembly (see para 2-11, step 24).

24. Function check M203A1, using function checks for the M203 in TM 9-1010-221-10, (page 3-13).

25. Re-zero M4/M4A1 carbine because installation of the M203A1 changes the zero of the M4 carbines.

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

3-7. 40MM GRENADE LAUNCHER M203/M203A1 —MAINTENANCE INSTRUCTIONS.

This task covers:

a. Disassembly c. Reassembly b. Inspection/Repair

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

Sealing compound (item 19, app D)

Equipment Condition a. Hand guard assembly removed from M16 series rifle. Refer to page 2-16.

b. Leaf Sight and Rail Grabber Assembly removal from M5 or M4 Adapter Rail System

DISASSEMBLY

DISASSEMBLY

Navy M16 Rifle Disassembly Pics

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

3-7. 40MM GRENADE LAUNCHER M203/M203A1 —MAINTENANCE INSTRUCTIONS (CONT).

INSPECTION/REPAIR

1. Inspect hand guard assembly for cracks or distortion. Cracks should not exceed 1 inch (2.54 cm) in length.

1. Inspect hand guard assembly for cracks or distortion. Cracks should not exceed 1 inch (2.54 cm) in length.

2. Inspect heat shield for tightness on hand guard. If heat shield is loose enough to rattle, the hand guard assembly must be replaced.

3. Inspect all parts for serviceability.

4. Replace all authorized unserviceable parts.

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Responses

  • goytiom
    How to instal M203 Mounting Kit?
    8 years ago
  • Gabriele
    How to install a m203 heat shield and flare launcher?
    4 years ago
  • Ermias
    How to install m203 quadrant sight?
    1 year ago
  • Karen Stone
    How does M203A1 attach to M4 adapter rail?
    6 months ago

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