Faxon Firearms 5.56 Gunner Lightweight 9310 Bolt Carrier Complete - Nitride- TiN PVD. 56/.300 Bolt Carrier Group BCG. These Bolt Carrier Groups from Faxon Firearms use only MIL-SPEC or better materials to ensure you only equip your weapon with the very best parts. The Faxon Firearms Gunner Lightweight 5.56/.300 BCG features forward assist serrations and it is compatible with dust covers so that you can protect the internal components from debris. Equip this durable and corrosion-resistant Faxon Firearms Gunner Lightweight 5.56/.300 Complete Bolt Carrier Group BCG to ensure your gun cycles properly with every pull of the trigger. Specifications for Faxon Firearms 5.56 Gunner Lightweight Bolt Carrier Complete: Manufacturer: Faxon Firearms Color: Gold Finish: Nitride Fabric/Material: 9310 Tool Steel Construction Carrier Material: 8620 Steel Bolt Material: 9310 Steel Caliber: 5.56x45mm NATO .300 AAC Blackout Hand: Right Features: Bolt: 9310 Tool Steel Construction (Stronger than C158) Full MIL-SPEC Heat Treatment Shot Peened to MIL-SPEC Magnetic Particle Inspection (MPI) Back of Lugs Chamfered for Reliability Spring Insert & "Crane" O-Ring Installed QPQ - Salt Bath Nitrided Extractor: S7 Tool Steel Construction Fully Heat Treated Shot Peened Per MIL-SPEC QPQ - Salt Bath Nitrided Carrier & Key: Superfinished Carrier Carrier: MIL-SPEC 8620 Steel Material Key: 4140 Steel Material Fully Heat Treated Forward Assist Serrations M16 (FULL-AUTO) Compatible Grade 8 Fasteners Fully & Properly Staked Key Permatex Sealed QPQ - Salt Bath Nitrided Weight w/ Key (Not Bolt or any Pins): 6.32 Ounces Cam Pin: 4140 Pre-Hardended Steel Material QPQ - Salt Bath Nitrided Package Contents: Faxon Firearms Gunner Light Weight 5.56/.300 Bolt Carrier Group Faxon Firearms FF556BCGCNITRIDE-LW-TiN: 5.56 Gunner Lightweight 9310 Bolt Carrier Complete - Nitride- TiN PVD