Toolcraft Black Nitride AR15 Bolt Carrier Group is a M16 Full Auto BCG, manufactured using a 9310 steel bolt, and a 8620 steel carrier. Carrier Specifications: Material: 8620 Steel Type: M16 Full Auto (Preferred for most AR-15 builds) Gas Key Material: 4130 Steel; Grade 8 Gas Key Screws Coating: Black Nitride Bolt Specifications: Bolt Material: 9310 Steel Extractor Material: 4140 Steel Mil-Spec O-Ring Mil-Spec Gas Rings (3) Cam Pin Material: 8620 Steel Firing Pin Material: 416 Stainless Steel Other: MPI Inspected Lifetime Warranty! from E-Arms (Product EATOOAUTO-016)

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