Very carefully lay the side of the feedlips on a solid object, flat, and take a small hammer and VERY gently tap the other side a couple times, then try it out in your gun. Repeat until it works properly. If you end up taking it a bit too far, you can use a round tapered diamond file to take of small amounts of metal from inside the feedlips. I've had a couple of my KSC M11 mags do a similar thing, you just need to close off the feedlips a slight bit to allow easy loading.
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