5.56 NATO or .300 AAC Blackout cal., 16 in. lightweight or lightweight M4 Nitride barrel, A2 flash hider, 30 shot Hexmag mag., Mil-Spec trigger, Magpul MBUS flip-up front and rear sights, Magpul MOE carbine stock and pistol grip, low profile gas block and tube, aircraft aluminum upper and lower receiver, M16 full auto BCG, Mil-Spec charging handle, includes Brigade rifle bag, ambi receiver plate for sling mount, 12 or 15 in. one-piece lightweight U-Rail, black anodized finish. Disc. 2019.