Note

Side swivel mount has to be on the right side of the M4/M4A1 when mounting the M203A1 Grenade Launcher.

7. Ensure side swivel mount has the sling swivel located on the right side of the M4/M4A1. If not, disassemble side swivel mount (see para 2-16, step 5A thru 5C).

8. Reassemble side swivel mount (see para 2-16, steps 4B thru 4D).

9. Install M203A1 to the M4/M4A1. a. Remove handguard.

Marine M203 Grenade Launcher

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

c. Depress the barrel stop (4) on the M203A1 receiver and ensure it operates through its full range of motion. If the barrel stop operates through its full range of motion, proceed to step 10.

d. If barrel stop is prevented from operating through its full range of motion by making contact with the bayonet lug on the M4/M4A1 carbine, remove the M203A1 receiver from the M4/M4A1 carbine.

e. Disassemble the barrel stop from the M203A1 receiver (see para 3-10, step 1).

M4a1 Carbine Rifle GoldM79 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

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