Description: Black Rifle, Black Rifle Arms, Black Rifle Works, Black Rifle Shop, Black Rifle Uppers, AR-15, AR15, AR 15, Gas Piston System, Gas Piston, Piston Driven, Piston System, nitrided barrels, melonite barrels, BRA, BRA Rifles, BRA Uppers, BRA PISTON SYSTEMS, B.R.A. Piston Uppers, Piston Conversions, 5.56, 7.62x39, 300BLK, 6.5 Grendel, 6.8 SPC, 300 Blackout, Piston carrier buffer, Bolt Carrier buffer, small firearm parts, Regulated Piston Rifles, Bolt carrier buffer, low recoil Bolt carrier, low recoil carrier, e
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Regulated Gas Block