Stag Arms 15 Tactical 5.56mm NATO 16in Flat Dark Earth Semi Automatic Modern Sporting Rifle - 30+1 Rounds. The Stag 15 Tactical Rifle is chambered in 5.56 NATO and built around a 16in barrel with a 1:7in twist rate. It features a Stag 13.5in M-LOK Handguard as well as forged upper and lower receiver in FDE Cerakote. These rifles have an VG6 Precision Delta  A2 style Flash Hider to reduce muzzle flash and a mid-length gas system that is combined with a low-profile gas block, which provides reliability under any condition. It's been upgraded with a Magpul K2+ grip and a Magpul STR butt stock.