The M-15(T) Complete Upper Assembly features a 20" 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.
M-15 Uppers use 7075-T6 Aluminum.
.875 at the Journal (Under the gas block)
Model: M-15A4(T) Complete Upper Assembly with Black Free Float Handguard
Caliber: .223/5.56 X 45 mm NATO
Barrel: 20" Triple Lapped, AISI 416R Stainless Steel, Heavy, M-4 Feed Ramps
Rifling Twist: RH 1:8"
Front Sight Base: Gas Block with Picatinny Rail Top of gas block is .293 (+/-) lower than top of upper receiver
Upper Receiver: Forged Flattop with Picatinny Rail, 7075-T6 Aluminum
Finish: Hard Anodized Aluminum, Manganese Phosphated Steel