ArmaLite's barrels are custom-made for extreme accuracy and long life. This complete barrel assembly includes a full front sight housing, barrel nut, slip ring, slip ring spring, slip ring retaining ring, gas tube and handguard cap.
.875 at the Journal (Under the gas block)
Caliber: .223 WYLDE CHAMBER
Barrel: 20" Tripple Lapped, AISI 416R Stainless Steel, M-4 Feed Ramps
Rifling Twist: RH 1:8"
Muzzle Device: None
Front Sight Base: A2 Front Sight Assembly with National Match Sight