I also have MAG brand 120 round mags, I cant use Madbull, wal-marts ,crappy tire bbs(only use them if you are 100% desperate).
For me its all about the polish. Only bb's with a very high polish will feed in my mags.
I've even washed mad bulls, but they still jam every other shot. The funny thing is. The madbulls have better tolerance than the bb's I am currently shooting. 5.95 +/- .01mm wont feed. 5.95 +/- .05mm feeds perfectly. Go figure.
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