AR-15 .223/5.56 Bolt Carrier Group- Black Nitride (Made in USA)Carrier M16 style (Auto) Machined from 8620 tool steel Heat treated to military specificationsBolt Machined from 9310 tool steel Heat treated to mi..
CarrierM16 styleMachined from 8620 tool steelHeat treated to military specificationsBoltMachined from 9310 tool steelHeat treated to military specificationsShot PeenedGround to meet military required tolerancesMPI (Mag Particle Inspected).125 bolt face depthGas KeyMachined from 4140He..
MADE IN THE U.S.A Heat treated, shot peened, relief cut, and machined to exact mil spec dimensions.Nickel boron coated to provide increased lubricity and much
greater wear resistance than other finishes. The coating makes easier cleaning Bolt Features Carpenter 158 Steel Hea..