HOW CMMG MK57 CAN SAVE YOU TIME, STRESS, AND MONEY.

As CMMG built a brand name partly by supporting and innovating unique calibers inside the AR System, the addition from the 5.7x28mm Mk57 small-barrel rifle here is likely only the beginning.The projectiles would stick or drag in there plus the follower would bind. Because the ProMags have no inward-projecting element and go away considerably more