A U.S.-based aerospace and firearms parts company, which has been manufacturing bolt carrier groups for the AR-15 and M16 rifles since 1991, offers precision manufacturing of the .223/5.56 bolts and bolt carriers to buyers of a high quality .308 bolt carrier assembly for the AR-10 rifle.

The .308 bolt, made by Young Manufacturing from SAE 9310 steel, is precision ground in three critical areas after heat treating to military specifications (mil-spec). This removes the distortion that occurs during heat treat and provides the most accurate fit possible on the center support ring and the bolt tail. Grinding the back of the lugs true to the bolt face produces a bolt that locks up true and square to the center of the bore. Bolts are magnetic particle inspected to detect any stress fractures that might occur during the heat treat process.

.308 carriers follow the same strict process as the .223 bolt assembly components, starting with 8620 steel heat treated to mil-spec, followed by precision grinding the inside bores and outside diameter to ensure they run concentric to each other and again remove the distortion from heat treat. The manufacturer adds additional surface or contact area near the front of the carrier for a tighter fit and support when the carrier is in the battery.

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