You asked for it and TNTE delivers! This M4 14.5" barrel with Extended A1 flash hider will be a perfect for your M4, 723, 727 or GUU clone. Featuring a 5.56 NATO chamber, the bore and chamber are nitride coated and the exterior has a QPQ finish. The barrel is made from 4150 11595E Steel. The gas system length is carbine. In being a retro barrel the gas block is .750" diameter. Forged front sight base is installed using taper pins. Our Extended A2 flash hider has been pinned and welded for NFA compliance.