Note

If assembling non-ribbed type barrel assembly, perform steps a through c. If assembling ribbed type barrel assembly without locking tab washer, perform steps d through j. If assembling ribbed type barrel with locking tab washer, perform steps k through s.

1. INSTALL MUZZLE BRAKE.

a. Apply antiseize compound to threads of 25-mm barrel (1).

b. Thread muzzle brake (2) all the way onto 25-mm barrel (1). Back off muzzle brake (2) until cotter pin hole (3) aligns with slot (4) in barrel threads.

M242 Bushmaster Cycle Operations

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NON-RIBBED (ROUND) BARREL ASSEMBLY

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c. Install new cotter pin (5) into muzzle brake (2) and bend ends of cotter pin (5) as shown.

M242 Bushmaster Cycle Operations

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