THE GREATEST GUIDE TO CMMG MK57

As CMMG created a brand partially by supporting and innovating distinctive calibers from the AR System, the addition of the 5.7x28mm Mk57 short-barrel rifle below is likely only the beginning.The projectiles would stick or drag in there along with the follower would bind. Given that the ProMags haven't any inward-projecting part and depart far mor