I have an older Mk7 44mag that I have installed a Mk19 50AE upper on. And i noticed that the 50AE mags fit SUPER tight. Not only do they not drop free... you have to pry them out at the bottom. I suspect it's the grip tabs rubbing too tightly on the mags. Will new (better) grips solve this issue? I was looking at Alumagrips anyway for it. Might be time to get them.