The M-15A4 7.62x39 Carbine Complete Upper Assembly features a double lapped, chrome lined\Chrome Moly Vanadium barrel. 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.
8" Gas System
M-15 Uppers use 7075-T6 Aluminum.
.750 at the journal (under the gas block)
Barrel: 16" Double Lapped, Chrome Lined\Chrome Moly Vanadium MIL-B-11595-E with M203 Step Down Threaded 5/8x24, M-4 Feed Ramps
Rifling Twist: RH 1:10"
Muzzle Device: A2 Flash Suppressor
Front Sight Base: Gas Block with Picatinny Rail
Upper Receiver: Forged Flattop with Picatinny Rail & Laser Engraved Rail Numbering, 7075-T6 Aluminum