12. Install compression helical spring (27) and barrel latch (28). Secure with headless straight pin (29) by installing headless straight pin flush to 0.030 in. (0.076 cm) slightly below the tip of the receiver. The headless straight pin must not be flush with or extend below the bottom surface.
b. Receiver staking shall be limited to four, placed 90 degrees apart at 3, 6, 9, and 12
c. Inspect staked area for cracked or separated material. Replace receivers that have cracked or separated material.
14. Place torsion helical spring (30) on barrel stop (31) and secure with headless straight pin (32). M203A1 ONLY Handguard assembly does not cover barrel stop pin holes (32.1) therefore one stake each side of receiver is required to retain barrel stop pin.
15. Insert tracks on barrel assembly (33) into tracks in receiver assembly (34). Lift up on barrel assembly (33) and compress barrel stop (31). Pull barrel assembly (33) rearward and barrel stop (31) will snap in place.
16. Perform function checks in accordance with TM 9-1010-221-10.
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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