LITTLE KNOWN FACTS ABOUT CMMG MK57.

As CMMG built a brand name partly by supporting and innovating unique calibers while in the AR System, the addition of the 5.7x28mm Mk57 quick-barrel rifle below is probably going only the start.The projectiles would stick or drag in there as well as follower would bind. Since the ProMags haven't any inward-projecting component and leave way more