Exactly what you expect of a premium barrel. - Criterion Barrels AR-15 Hybrid Nitrided Rifle Gas System Barrel

Used with an AP AR15 Upper. Barrel is 18" Hybrid in 223 Wylde 1:8 Rifle length gas. M4 feedramps aligned exactly side to side and to the correct depth. Gas port diameter measures at 0.092", plenty for supers. Barrel pin aligns exactly with gas port, but barrel label (rolled marks) are offset slightly from center. Do not use for centering up. Muzzle thread 1/2x28 excellent cut and 5/8" to shoulder. Muzzle flat faced with no crown. 0.75" gas block is 1 7/8" long. One dimple exactly opposite the gas port. Nice very deep black nitride. Well made high quality manufacture.