Technical Information Upper Receiver: A3 Flat-Top Barrel Length: 16" Barrel Contour: Heavy Barrel Material: 4140 Chrome Moly Steel Muzzle Thread Pattern: 5/8"-24 Chrome Lined: No Barrel Finish: Matte Black Twist Rate: 1 in 10" Chamber: 7.62x39mm Bore Diameter. Supplied without a rear sight, this upper is a great platform for a red dot sight or iron sights (both sold separately). The A3 upper will attach to virtually any standard AR-15 lower receiver and comes complete with charging handle, forward assist, ejection port cover, A2 flash hider, bolt and bolt carrier assembly. MidwayUSA is proud to offer this AR-Stoner A3 Upper Receiver Assembly at an exceptional price! This AR-Stoner carbine length upper features a mil-spec bolt carrier group, phosphate finish, A2 fixed front sight, and a heavy profile barrel.
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