Tacfire .308 Bolt Carrier Group BCG QPQ Nitride Treated Steel Black. The Tacfire .308 Bolt Carrier Group BCG is built to provide dependable operation. These Bolt Carrier Groups are made for a DPMS LR 308 GEN. 1 pattered AR rifle. It is Serrated for use with a forward assist. If you're looking for smoother operation with your AR-15 you can not go wrong with a .308 Bolt Carrier Group BCG from Tacfire Specifications for Tacfire .308 Bolt Carrier Group (BCG): Manufacturer: TacFire Color: Black Finish: QPQ Nitride Caliber: .308 Winchester Gun Model: AR-10 Condition: New Projectile Caliber: .308 Caliber Country of Origin: USA Features of Tacfire .308 Bolt Carrier Group BCG: 8620 Steel Carrier 9310 Steel Bolt QPQ Nitride Treated Magnetic Particle Inspected Shot Peened Serrated for use with Forward Assist Nitride Treated Gas Key and Extractor Staked Gas Key Package Contents: Tacfire .308 Bolt Carrier Group What firearm models does the manufacturer say Tacfire .308 Bolt Carrier Group (BCG) is compatible with? The manufacturer suggests that Tacfire .308 Bolt Carrier Group (BCG) is compatible with AR-10Tacfire BCG-308: 308 Nitride QPQ Treated Bolt Carrier Group Black