AR15 / M4 5.56 NATO (.223) Barrel Assembly
This new U.S. made barrel is 16" long with 6-groove rifling and 1/9" twist. M4 contour barrel is non-chrome lined for easy headspacing and comes complete with gas hole, front sight base with bayonet lug, barrel extension, barrel nut, round handguard cap and a magnesium phosphate finish. Muzzle end is threaded for 1/2 x 28 TPI flashhiders or muzzlebrakes. Front sight post is not included.