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FailZero 5.56 Full Auto Lightweight BCG

JP Enterprises Full Mass Operating System Bolt Carrier .308 Win, Black

AERO PRECISION AR15 5.56 Pro Series Bolt Carrier Group - Black Ni

BATTLE ARMS Enhanced Bolt Carrier Group AR15/M16 Black

JP Enterprises Aluminum Ultra Low Mass Bolt Carrier w/.223 Bolt JPBC-1A