Fixed! CMMG 9mm AR15 Rotary Delayed Blowback Upper Made Reliable!
Semiauto Rifles
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10m
Mike (Bloke) tells of how he fixed his 300 series CMMG Resolute 16" 9mm Para rotary delayed blowback upper on his WWSD2020 KE Arms lower to make it reliable with a stiffer ejector spring (from David Tubb). The ejection problems were quite substantial, and have now been fixed.
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