Have a helper hold barrel with a strap wrench while removing the spanner nut.
c. Loosen spanner nut (5) until it is completely backed off threaded area of 25-mm barrel (6).
d. Remove machine key (7) from muzzle brake (8).
e. Unscrew muzzle brake (8) from 25-mm barrel (6).
RIBBED (NITRIDE OR CHROME) BARREL ASSEMBLY WITHOUT LOCKING TAB WASHER
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