Armalite's barrels are custom-made for extreme accuracy and long life.
This complete barrel assembly includes a MIL-STD 1913 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)
Model: M-15 post-ban carbine barrel assembly
Caliber: 5.56X45 MM / .223
Barrel: 16" chrome lined\chrome moly vanadium, M-4 feed ramps
Rifling Twist: 1:7" RH
Muzzle Device: Permanentley afixed muzzle brake
Finish: Manganese phosphated steel