The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158 steel, shot peened for increased strength, includes tool steel machined extractor and ejector, Extractor Spring, SBN, and is MPI (Magnetic Particle Inspected). Specifications for Bushmaster Bolt Carrier Group (BCG) 5.56 NATO w/Logo: Manufacturer: Bushmaster Color: Black Finish: Salt Bath Nitride Fabric/Material: Steel Cartridge: 5.56x45mm NATO Gun Model: M16 Bolt Material: Steel Carrier Material: 8620 Steel Features of Bushmaster Bolt Carrier Group BCG 5.56 NATO w/Logo M16-cut carrier Properly staked gas key Shot Peened Bushmaster Logo MPI Tested Package Contents: Bushmaster Bolt Carrier Group 5.56 NATO w/Logo
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