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.
Caliber: 5.56 NATO/.223
Barrel: 20" Triple Lapped, AISI 416R Stainless Steel, M-4 Feed Ramps
Rifling Twist: RH 1:8"
Muzzle Device: None
Front Sight Base: Gas Block with Picatiny Rail