The key to MAG midcaps is to keep pressure on the top of the mag to prevent the halves from splitting apart. That keeps them from breaking. Even when they are new. That and only loading one of the ~90 round pistol mag speed loaders does wonders as well. I love my "130 rounders" but only load em to 90 each time and never have issues with feeding in my ICS. Then again, ICS guns are natorious for feeding on just about every crappy mag. Having said that, my ICS wont feed for sh!t on my last remaining TM 68 rounder... Not sure why that is, probably just the mag being finicky. Typical TM mags IMO.