The AR-10(T) 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)
Model: AR-10(T) Upper with Free Float Black Handguard
Caliber: .308/7.62 X 51mm NATO
Barrel: 20" Triple Lapped, AISI 416R Stainless Steel, Heavy, M-4 Feed Ramps
Rifling Twist: RH 1:10"
Muzzle Device: None
Front Sight Base: Picatinny Rail Gas Block. Top of gas block is .398 (+/- .010) lower than top of receiver
Upper Receiver: Forged Flattop with Picatinny Rail and Forward Assist 7175-T74 Aluminum
Finish: Hard Anodized Aluminum, Manganese Phosphated Steel