Faxon Firearms 5.56/300BLK M16 Bolt Carrier Group BCG Complete Nitride. Use this Faxon Firearms 5.56/300BLK M16 Bolt Carrier Group BCG to create a more reliable and precise rifle for any application. Faxon Firearms crafted these Bolt Carrier Groups with a 9310 tool steel bolt that's nitride for increased hardness decreased resistance and enhanced corrosion resistance. This Faxon Firearms 5.56/300BLK M16 BCG is Superfinished to reduce friction and fouling and they are full-auto compatible. Boost your accuracy and create a longer-lasting gun by installing the Faxon Firearms 5.56/300BLK M16 MIL-SPEC Bolt Carrier Group BCG. Specifications for Faxon Firearms 5.56/300BLK M16 Bolt Carrier Group: Manufacturer: Faxon Firearms Color: Black Finish: Nitride Fabric/Material: 9310 Tool Steel Bolt Carrier Material: 8620 Steel Bolt Material: 9310 Steel Caliber: 5.56x45mm NATO Gun Make: AR Platform Gun Model: AR-15 Condition: New Treatment: Full MIL-SPEC Heat Features: 9310 Tool Steel Bolt 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 Salt Bath Nitrided Bolt & Carrier S7 Extractor Superfinished Carrier Body Full Auto Compatible Forward Assist Serrations Package Contents: Faxon Firearms 5.56/300BLK M16 Bolt Carrier Group (BCG) What firearm models does the manufacturer say Faxon Firearms 5.56/300BLK M16 Bolt Carrier Group is compatible with? The manufacturer says that Faxon Firearms 5.56/300BLK M16 Bolt Carrier Group is compatible with AR-15Faxon Firearms FF556BCGCNITRIDE: 5.56/300BLK M16 Bolt Carrier Group BCG Complete Nitride