Faxon Firearms 6.5 Grendel Type 2 .136 9310 Bolt Complete Black. These Bolt Carrier Groups from Faxon Firearms are machined from 9310 tool steel and are Salt Bath Nitrided for improved resistance to corrosion and wear ensuring your bolt is built to last. The Faxon Firearms Faxon AR-15 Steel Bolt is shot peened to MIL-SPEC and both the bolt and extractor are heat-treated to for maximum strength. Equip this high-quality Faxon Firearms Faxon 6.5 Grendel AR-15 Bolt to make sure your weapon is firing at its full potential. Specifications for Faxon Firearms 6.5 Grendel Type 2 .136 9310 Bolt Complete: Manufacturer: Faxon Firearms Color: Black Nitride Finish: Type II Caliber: 6.5mm Grendel Gun Model: AR-15 Gun Type: Rifle Hand: Ambidextrous Condition: New Features of Faxon Firearms Faxon AR-15 Bolt Detailed Specifications: 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 and "Crane" O-Ring Installed QPQ - Salt Bath Nitrided .136" Co-Bore (Type II) Bolt Face for 6.5 Grendel Package Contents: Faxon Firearms Faxon AR-15 Bolt What firearm models does the manufacturer say Faxon Firearms 6.5 Grendel Type 2 .136 9310 Bolt Complete is compatible with? The manufacturer says that Faxon Firearms 6.5 Grendel Type 2 .136 9310 Bolt Complete is compatible with AR-15Faxon Firearms FF65GBCNITRIDE: 6.5 Grendel Type 2 .136 9310 Bolt Complete Black