Shop BRT Barrels Barrels Uppers Uppers BCG / Upper Parts BCG / Upper Parts Adjustable Gas Drive Adjustable Gas Drive Gas System Gas System Muzzle Devices Muzzle Devices Featured Products BRT 10.5" PRO 556 Barrel BRT 10.5" PRO 556 Barrel $199.00 BRT 16" PRO 556 Barrel BRT 16" PRO 556 Barrel $199.00 BRT M4A1 Bolt Carrier Group C158 HPT/MPI Auto BRT M4A1 Bolt Carrier Group C158 HPT/MPI Auto $169.00 BRT EZTUNE Gas Tube - Configurable - Midlength BRT EZTUNE Gas Tube - Configurable - Midlength $64.95