THE 5-SECOND TRICK FOR CMMG MK57

As CMMG designed a brand partly by supporting and innovating exclusive calibers during the AR platform, the addition of the 5.7x28mm Mk57 quick-barrel rifle below is likely only the beginning.The projectiles would stick or drag in there and also the follower would bind. Since the ProMags have no inward-projecting aspect and leave way more clearanc