CMMG MK57 FUNDAMENTALS EXPLAINED

As CMMG constructed a model partly by supporting and innovating one of a kind calibers in the AR platform, the addition in the five.7x28mm Mk57 shorter-barrel rifle here is likely only the beginning.The projectiles would adhere or drag in there as well as the follower would bind. Given that the ProMags don't have any inward-projecting section and