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