FF556BCNITRIDE

Faxon Firearms Bolt556NATOFits AR-15Nitride FinishBlackFeatures:9310 Tool Steel ConstructionFull MIL-SPEC Heat TreatmentShot Peened to MIL-SPECMagnetic Particle Inspection (MPI)Back of Lugs Chamfered for ReliabilitySpring, Insert, & Crane O-Ring InstalledSalt Bath Nitrided