Procedures are written for the M240 machine gun but apply to all models of the machine gun except where indicated.
When installing the barrel (4) in the receiver, rotate the barrel release latch/carrying handle assembly (2) clockwise until it stops. Unlock and rotate counter-clockwise completely. While rotating clockwise, count the number of clicks until it stops. Fewer than 2 or more than 7 clicks indicate defective parts. (Make this check with spare barrel also.)
Check operation and position of the barrel release latch (1), barrel release (2), and barrel locking latch (3). Barrel (4) must be locked securely in receiver.
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