Barrel and barrel adapter have left-hand threads.

(M240/M240C/M240D/M240E1): Place barrel release latch (24) in barrel release (23). Hold them vertically and place firmly against front shoulder of barrel (12).

M240 Barrel Nut

Screw barrel adapter nut (25) onto barrel (12) finger-tight.

Unscrew barrel adapter nut (25) until barrel release latch (24) engages the recess in barrel adapter nut (25).

Secure barrel release latch (24) to barrel release (23) with new spring pin (22).

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