The AR-10A4 Complete Upper Assembly features a double lapped, chrome lined 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.
- Model: AR-10 A4 Complete Upper Assembly with Black Handguard
- Caliber: .308⁄7.62 X 51mm NATO
- Barrel: 20″ Double Lapped, Chrome Lined
- Rifling Twist: RH 1:11.25″
- Muzzle Device: Flash Suppressor
- Front Sight Base: Gas Block with Picatinny Rail
- Upper Receiver: Forged Flattop with Picatinny Rail
- Finish: Hard Anodized Aluminum, Maganese Phosphated Steel