The AR-10(T) .338 Federal Complete Upper Assembly features a triple-lapped stainless steel barrel floated within a rugged aluminum handguard. The Picatinny Rail on the upper receiver and the gas block allow rapid and repeatable interchange of removable iron or scope sights.
Each ArmaLite Complete Upper Assembly includes a forged upper receiver assembly, barrel assembly, bolt carrier group and charging handle assembly. All complete upper assemblies are test fired as complete rifles before shipping.
AR-10 uppers use 7175-T74 aluminum.
.875 at the Journal (Under the gas block)
Caliber: .338 Federal
Barrel: 22" Triple Lapped, AISI 416R Stainless Steal Match, M-4 Feed Ramps
Rifling Twist: 1:10
Muzzle Device: None
Upper Receiver: Forged Flattop with Picatinny Rail 7175-T74 Aluminum