Me shooting my Colt/NoDak Spud XM177 clone Registered SBR with CMMG 22 ARC Bravo SS Conversion Kit and SilencerCo Sparrow SS. This thing is quiet!
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I have a 7.5 inch 1:7 twist SBR with the cmmg conversion kit and works great as a training tool, although accuracy is not that great. Been reluctant to put my SiCo Spectre2 on it cause of the possible baffle strikes. What length and twist are you running?