Brownells AR-15/M16 Barrels, made for Brownells by Satern Barrels, feature 5R button rifling and are machined from 416R gun barrel steel for a superior shooting barrel. This 223 Wylde barrel feature a stainless steel finish, for the ultimate in performance and asthetics. This barrel has a 1-8 twist, for excellent performance with heavier bullets, especially those 62gr or heavier. Available in a 20” length, with a rifle length gas system. Muzzle is threaded for ½-28 and the gas shoulder accepts .750 gas blocks. Opposite side of gas port features dimples, so that gas block set screws are secured in place, preventing movement.