Rotary Delayed Blowback: CMMG 9mm AR15 Upper On WWSD 2020 Lower
Semiauto Rifles
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15m
Mike (Bloke) takes a look at a 300 series CMMG Resolute 16" 9mm Para rotary delayed blowback upper on his WWSD2020 KE Arms lower.
Aside from a little reliability issue on the ejection, which he's hopeful he will be able to solve, he thinks this system is absolutely great!
And obviously the intro is a tribute to @lockpickinglawyer
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