Faxon Firearms 5.56/300BLK Gunner Light Weight Bolt Carrier Group BCG Nitride. 56/300BLK Gunner Light Weight Bolt Carrier Group BCG. These Bolt Carrier Groups made by Faxon Firearms are built from the best materials possible and are Superfinished for reduced friction and fouling resulting in smooth operation with every use. The Faxon Firearms 5.56/300BLK Gunner Light Weight BCG is compatible with dust covers so that you can protect the internal components. All aspects of this Bolt Carrier Group BCG are coated in a Salt Bath Nitride that enhances resistance to corrosion and wear. Dominate targets anywhere you need to with the help of this Faxon Firearms 5.56/300BLK Gunner Light Weight MIL-SPEC Bolt Carrier Group BCG. Specifications for Faxon Firearms 5.56/300BLK Gunner Light Weight Bolt Carrier Group: Manufacturer: Faxon Firearms Color: Black Finish: Nitride Carrier Material: 8620 Steel Bolt Material: 9310 Steel Caliber: 5.56x45mm NATO Gun Make: AR Platform Gun Model: AR-15 Weight: 8.5 oz Condition: New 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 5.56/300BLK Gunner Light Weight Bolt Carrier Group (BCG) What firearm models does the manufacturer say Faxon Firearms 5.56/300BLK Gunner Light Weight Bolt Carrier Group is compatible with? The manufacturer says that Faxon Firearms 5.56/300BLK Gunner Light Weight Bolt Carrier Group is compatible with AR-15Faxon Firearms FF556BCGCNITRIDE-LW: 5.56/300BLK Gunner Light Weight Bolt Carrier Group BCG Nitride