Hello all, I'm building a 9" 300blk Ar pistol and I'm curious to hear what yall thank. Can the same gun easily shoot both subsonic and supersonic 300BLK rounds? Can I just switch out mags one with subs and one with supers? I have heard both ways, some say that its works fine others say that it wont. The upper and BCG is all coming from BCM. Let me know what yall think, thanks.
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