ZRODelta M16 Nitride Bolt Carrier Group BCG Performance 5.56/223/300BLK 9310 Bolt w/ Billet extractor Black. These Bolt Carrier Groups by Unbranded installed in mere minutes so you can focus on more important aspects of your build. With a nitride coating the Unbranded Bolt Carrier Group resists corrosion and holds up under intense firepower resulting in a reliable bolt carrier that will withstand even the most intense fire. This high-quality bolt carrier will ensure smooth operation shot peened armament and a Mil-Spec extractor that won't give out under extreme conditions. For a durable and reliable bolt carrier look no further than the Unbranded Bolt Carrier Group. The MPI shot peened and staked keys ensure the key stays in place regardless of the forces that are working on it. When quality and reliability are at stake you can't beat the UnbrandedAR Bolt Carrier Group. Specifications for ZRODelta M16 Nitride Bolt Carrier Group (BCG): Manufacturer: ZRODelta Color: Black Finish: Nitride Fabric/Material: 9310 Steel Bolt Material: 9310 Steel Caliber: 5.56x45mm NATO .223 Wylde .300 AAC Blackout Gun Make: AR Platform Gun Model: AR-15 Hand: Ambidextrous Weight: 11.5 oz Additional Features: Bolt w/ Billet Extractor Features of ZRODelta M16 Nitride Bolt Carrier Group BCG Mil-Spec Tool or MIM Steel Extractor w/ Crane (NAVSPECWAR) o-ring spring Nitrided throughout assembly including carrier and key MPI Shot Peened Mil-Spec Staking on the Key Package Contents: ZRODelta M16 Nitride Bolt Carrier Group (BCG) What firearm models does the manufacturer say ZRODelta M16 Nitride Bolt Carrier Group (BCG) is compatible with? The manufacturer suggests that ZRODelta M16 Nitride Bolt Carrier Group (BCG) is compatible with AR-15ZRODelta 7034-0039-0000: M16 Nitride Bolt Carrier Group Performance 5.56/223/300BLK 9310 Bolt w/ Billet extractor Black