Dedicated CMMG 22LR upper. 4.5″ CMMG 22LR 1:16 barrel w/ CMMG BCG. S&W M&P22 magazine adapter. Last round hold open works, eats federal bulk box ammo without issue.
www.quietprofessionalfirearms.com
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Thats the only way i can shoot inside my house and not piss off the wife.
I just ordered one of these for my sbr. How's it holding up as far as reliability? who makes the adapter for s&w mags? Does the same adapter have the bolt hold open feature?