Steiner

Green Mountain Barrels 16" SS M4 5.56 NATO 1:8" twist Mid Length 5.56 mm, 1:8 twist, 16" long, 416 stainless steel, weighs 1.9 lbs., replacement barrel for  mid length gas system, button rifled, stress relieved, air gauged, gas ported, and assembled with an extension with M4 feed ramps, muzzle threading of 1/2" x 28". Barrel is not pinned for a front sight base.