Complete match grade Ar-15 nickel boron coated bolt and carrier.
Complete Match Grade AR-15 Nickel Boron coated bolt and carrier.Specs:Bolt: 9310 steel, MPI tested, case-hardened, nickel-boron coatedCarrier: Mil-Spec 8620 steel, staked with original Colt Mil-Spec screws, heat-treated, nickel-boron coated, full-auto ratedGas key:  Original Colt Mil-Spec screws, staked, nickel-boron coatedExtractor: Heat-treated, dual nested extractor springs exceeding Mil-SpecCam pin: Heat-treated, nickel-boron coated