Home AR-15 AR 15 Sub Sonic 450 Bushmaster upper

AR 15 Sub Sonic 450 Bushmaster upper

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Second time out with my custom 450 Bushmaster Sub-Sonic upper, I opened up the gas port a little & now it cycles. It has a rifle length buffer as I intend to use this lower on several different uppers. I used a pistol length gas system & 9.5″ barrel with suppressor. See more from me at

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