The M-15A2 Carbine Complete Upper Assembly features a double lapped, chrome lined\Chrome Moly Vanadium barrel.
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.
M-15 Uppers use 7075-T6 Aluminum.
.750 at the journal (under the gas block)
Model: M-15A2 Carbine Complete Upper Assembly with Black Handguard
Caliber: .223/5.56 X 45 mm NATO
Barrel: 16" Double Lapped, Chrome Lined\Chrome Moly Vanadium MIL-B-11595-E, M-4 Feed Ramps
Rifling Twist: RH 1:9"
Muzzle Device: Permantley afixed Muzzle Break
Front Sight Base: A2 Front Sight Assembly
Upper Receiver: Forged A2, 7075-T6 Aluminum
Finish: Hard Anodized Aluminum, Manganese Phosphated Steel