I have mentioned that I tweak my mags for better accuracy from my minis, I used a pair of channel lock pliers or lineman pliers to bend the front of the feed lips up slightly. My best shooting mags is a Promag 20, the steel is easier to bend, so don't give up on cheap mags. I have been working with some of my factory 20 and 5 rd mags to get them shooting better but it takes longer because they have stronger steel. The first picture is the tweaked mag showing the slight upward bend on the feed lip. The second picture is a stock mag for comparring. I bend both sides of the mags, the factory is tough to bend so be careful, it's easier to bend up but bending down is even tougher.