**NFA short barrel rules do apply, please check with your local State laws for legal ownership**
The M-15A4 LEC Carbine Complete Upper Assembly with A2 front sight features a chrome lined barrel with M-203 step down. The Picatinny Rail on the upper receiver allows 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.
M-15 Uppers use 7075-T6 Aluminum.
.750 at the journal (under the gas block)
Model: Commercial ISP Carbine Upper Assembly
Caliber: .223/5.56 X 45 mm NATO
Barrel: 11.5" Chrome Lined\Chrome Moly Vanadium MIL-B-11595-E with M-203 Step Down, M-4 Feed Ramps
Rifling Twist: RH: 1:7"
Muzzle Device: Flash Suppressor, Threading:1/2" - 28
Front Sight Base: A2 Front Sight Assembly
Upper Receiver: Forged Flattop with Picatinny Rail, 7075-T6 Aluminum
Finish: Hard Anodized Aluminum, Manganese Phosphated Steel