CMMG MK57 SECRETS

As CMMG designed a model in part by supporting and innovating one of a kind calibers in the AR System, the addition in the 5.7x28mm Mk57 limited-barrel rifle here 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 element and go away a lot mo