Faxon Firearms 458/ 458 AR15 Bolt Carrier Group

Seeing in MIL-SPEC in as just the starting point, we set out to ensure the best options are available for our demanding customers. Improvements include using 9310 tool steel for the bolt, nitriding the assembly to increase surface hardness, decrease resistance, and have superior corrosion resistance compared to typical phosphated bolts. All bolts are fully MPI tested to ensure the material is sound and without defects. Bolt lugs are chamfered 45 degrees to ensure reliable action for even the highest pressure hand loads and fast lightweight actions. Extractors are S7 Tool Steel. From there, the extractor is sprung using the spring, o-ring, and silicone insert. Detailed Specifications: Bolt: 9310 Tool Steel Construction Full MIL-SPEC Heat Treatment Shot Peened to MIL-SPEC Magnetic Particle Inspection (MPI) Back of Lugs Chamfered for Reliability Salt Bath Nitrided Extractor: S7 Tool Steel Construction Fully Heat Treated Shot Peened Per MIL-SPEC Specifications for Faxon Firearms 458/ 458 AR15 Bolt Carrier Group: Manufacturer: Faxon Firearms Color: Black Finish: Salt Bath Nitrided Fabric/Material: 9310 Tool Steel Cartridge: .458 SOCOM, .458 Winchester Magnum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Bolt Material: 9310 Steel Package Contents: Faxon Firearms 458/ 458 AR15 Bolt Carrier Group (BCG)