ArmaLite's barrels are custom-made for extreme accuracy and long life. This complete (T) barrel assembly includes a Picatinny rail gas block, barrel nut, gas tube and handguard cap.
.875 at the Journal (Under the gas block)
Model: AR10 (T)
Caliber: .308/7.62 X 51mm NATO
Barrel: 20" AISI 416R Stainless Steal, Heavy, M-4 Feed Ramps
Rifling Twist: RH 1:10"
Muzzle Device: None
Front Sight Base: Gas Block with Picatinny Rail