Assembly Continued

d. Thread spanner nut (6), grooved side first, past threads until it lies loose on 25-mm barrel (7).

e. Apply antiseize compound to threads of 25-mm barrel (7).

f. Thread muzzle brake (8) completely onto 25-mm barrel (7) until snug.

g. Back off muzzle brake (8) until barrel keyway aligns with muzzle brake keyway. Do not turn muzzle brake more than one complete turn when aligning keyways.

h. Install machine key (9) into keyway (10).

i. Thread spanner nut (6) on 25-mm barrel (7) and tighten against muzzle brake (8) and machine key

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