Premium lightweight AR-15 barrel by Ballistic Advantage. Features hard chrome bore and chamber for corrosion resistance and easy cleaning. Exterior finish is phosphate for a matte look. Button-rifled barrel profile made from 4150 Chrome Moly Vanadium steel. Wylde chamber accommodates 223 Remington and 5.56x45 NATO. 1/2-28 muzzle threads and M4 feed ramps ensure compatibility with common uppers.