Guntec USA Bolt Carrier Group BCG Ar10 .308 Mil-spec Nitride. These Bolt Carrier Groups from Guntec USA have a properly-tightened and gas key staked properly so users don't need to worry about damaging their BCG's finish. For even further corrosion resistance the Guntec USA AR-10 Bolt Carrier Group is Nitride Treated - the black finish is much more durable than other finishes and it's heat-treated to H900 condition giving it extra-strength resistance. For ease of use this Bolt Carrier Group from Guntec USA has a Nitride-treated 8620 carrier which allows the shooter to easily keep the bolt carrier group apart for cleaning. A properly-tightened gas key properly secures this BCG giving users of this device a more reliable and dependable firearm. For a dependable corrosion-resistant and tough BCG make sure you grab the Guntec USA AR-10 Bolt Carrier Group. Specifications for Guntec Usa Guntec Bolt Carrier Group (BCG) Ar10 .308 Mil-spec Nitride: Manufacturer: Guntec USA Color: Black Finish: Nitride Fabric/Material: Steel Carrier Material: 8620 Steel Bolt Material: 9310 Steel Caliber: .308 Winchester Gun Make: AR Platform Gun Model: AR-10 Hand: Right Projectile Caliber: .308 Caliber Features: Made for 7.62X51 / 308 Cal 9310 Hardened Steel Bolt 17-4 Stainless Steel Firing Pin (Heat treated to H900 Condition) The group comes fully assembled with properly torqued and staked gas key Nitride Treated 8620 carrier and gas key. HPT/MPI Tested and Marked Hardened extractor S7 tool steel. Package Contents: Guntec Usa Guntec Bolt Carrier Group Ar10 .308 Mil-spec Nitride The Guntec Usa Guntec Bolt Carrier Group Ar10 .308 Mil-spec Nitride is a quality addition to the Guntec USA lineup. For more great deals on Bolt Carrier Groups by Guntec USA please browse our GUNTEC USA Gun Parts page. What firearm models does the manufacturer say Guntec Usa Guntec Bolt Carrier Group (BCG) Ar10 .308 Mil-spec Nitride is compatible with? The manufacturer says that Guntec Usa Guntec Bolt Carrier Group (BCG) Ar10 .308 Mil-spec Nitride is compatible with AR-10