Anyone have any problems with these? I just bought a power mag last week and have heard amazing things about them. With that being said, I took it to the range today with me to test it out and had a bunch of failure to feeds. About 1-2 each time (100 rounds). I know they'll take care of it for me b/c their customer service is great but didn't know if for some reason if they had to be broken in or anything. My stock mags worked fine, no problem. For all I know my stock ones could be CMC. They have the same notched out part underneath the feed lip like the CMC's and feel like the same kinda of finish to boot, the only difference is how much smoother and eaiser it is to put a round in the CMC. Any advice guys?