This is Nordic Components’ newest barrel for the AR-15 type weapon. This 416R Stainless Steel barrel is 18″ long with a rifle length gas system. Chambered in .223 Rem with a 1 in 8″ twist rate, it is the perfect barrel for your competition rifle. The barrel smoothly transitions to an .800 diameter that runs all the way to the gas block. It steps down to .750 for the gas block area and then is a .740 diameter until the 1/2″-28 threads at the muzzle. It is compatible with any 1/2″-28 threaded flash hider, compensator or suppressor. The barrel is furnished with an M4 style barrel extension and weighs 2 lbs., 6 oz.