Once the Mk57 locks back on empty, you’ll find the oversized magazine release paddle appropriate where you’d assume. The projectiles would stick or drag in there along with the follower would bind. As the ProMags don't have any inward-projecting part and leave way more clearance to the bullets, that https://cmmgmk5758024.blogsidea.com/37074359/the-basic-principles-of-cmmg-mk57