CMMG has announced the release of a new line of AR pistols and short-barreled rifles (SBR’s) chambered in FN 5.7x28mm.  The Mk57 line-up takes this blazing fast, low-recoiling round to new heights. Featuring CMMG’s Radial Delayed Blowback operating system, the Mk57 is exceptionally fun to shoot, capable of shooting targets out to 200 yards and […]