A variant of the Sig Sauer P320 with a number of upgrades to include a coyote-tan PVD coated stainless steel slide and a removable top plate for optics, the M18 can use a 17-round 9mm…Compact Semi-Automatic Sniper System, CSASS rifle, Gun culture, H&K, Heckler & Koch, Heckler & Koc...