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The Maple Ridge Armoury AR-15 Nitride Bolt Assembly is a precision machined, US MilSpec bolt for the AR-15, M16, M4 series semi-automatic firearm. All bolts are ground after heat treatment and then MPI tested as part of our strict quality control. Our Enhanced bolt assembly is nitro-carbuized, cryogenically stress relieved and black nitride treated providing excellent corrosion resistance, wear resistance, hardness , and lubricity. The bolt face is chamfered to assist with engagement with the cartridge and along with the rubber extractor insert assist in ejection of the spent case.