.223 Wylde chamber, 5.56 NATO, .300 AAC Blackout, or 7.62x39mm cal., 7 1/2 in. SS HBAR barrel, SS A2 flash hider, 30 shot PMAG, A2 pistol grip, optional SIG brace (new 2019, black or FDE finish), M4 feed ramps, low profile gas block, pistol length gas tube, M16 BCG, forged aluminum A3 flat-top upper and Red X Arms lower receiver, Mil-Spec charging handle, free floating carbine length quad rail, straight, spiral, or diamond fluted pistol buffer tube assembly, ambi endplate sling adapter, includes soft tactical rifle case with mag. pouches, hardcoat anodized black finish, approx. 5 lbs. Disc.