Faxon Firearms 6.8/224 Valkyrie Bolt- Nitride. These Bolt Carrier Groups from the folks at Faxon Firearms feature 9310 Steel Construction that is harder and more durable than traditional metals. O-ring sealed the Faxon Firearms 6.8/224 Valkyrie Bolt can outperform the competition in inclement weather. Fully heat treated this bolt is ideal for rapid fire succession. Get high pressure hand loads with the uniquely designed Faxon Firearms AR-15 Valkyrie Bolt. Specifications for Faxon Firearms 6.8/224 Valkyrie Bolt: Manufacturer: Faxon Firearms Finish: Black Nitride Fabric/Material: 9310 Steel Caliber: .224 Valkyrie Hand: Ambidextrous Features of Faxon Firearms Nitrided Valkyrie Bolt 11I-FBL-FDSD2 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 Package Contents: Faxon Firearms Valkyrie Bolt Nitrided 11I-FBL-FDSD2 Faxon Firearms FF224BCNITRIDE: 6.8/224 Valkyrie Bolt- Nitride