ArmaLite's barrels are custom-made for extreme accuracy and long life. This complete barrel assembly includes a Picatinny rail gas block, barrel nut, slip ring, slip ring spring, slip ring retaining ring, gas tube and handguard cap.
750 at the journal (under the gas block)
8" Gas System
Barrel: 16" Double Lapped, Chrome Lined\Chrome Moly Vanadium MIL-B-11595-E with M203 Step Down Threaded 5/8x24, M-4 Feed Ramps
Rifling Twist: RH 1:10"
Muzzle Device: Flash Suppressor
Front Sight Base: Gas Block with Picatinny Rail
Finish: Manganese Phosphated Steel