OK... Might have to revisit the CMMG delayed blowback option then. Do those typically need smithing as well or are they gtg out of the box?
Looking for this to be a pistol with brace and bbl <10". I own no suppressors at present, but my intent is to have something that can accommodate one and alternatively shoot supersonic 115gr also. Is this realistic, again without a lot of tuning?
Guess bolt hold open is not realistic, shame about that but certainly good to know, thanks Chad!
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The CMMG seems to be just fine out of the box. I have limited personal experience, and readings on the interwebz.