Primary Weapons Systems MK1, Mod 2, Semi-automatic Rifle, 223 Wylde/556NATO, 16.1 Barrel, Mid-length Gas System, 1:8 Twist, Anodized Finish, Black, Magpul Stock, Magpul Grip, 30 Rounds, 1 Magazine MK1-M2R-223-16 The most popular firearm offered by PWS, the MK116 MOD 2-M offers a well-balanced rifle for shooters looking to take 5.56 to new distances. Being deadly accurate, the MK116 is ideal for shooters looking for a multi-purpose tool without NFA paperwork.