CMMG MK57 FUNDAMENTALS EXPLAINED

As CMMG crafted a brand name partly by supporting and innovating special calibers while in the AR System, the addition of the 5.7x28mm Mk57 short-barrel rifle listed here is likely only the start.The projectiles would stick or drag in there along with the follower would bind. As the ProMags don't have any inward-projecting element and depart way m