40 round mag catching bolt

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So my friend picked me up a preban 40 round mag at a gun show a few weeks back and it seems to be jamming up the bolt.

When the bolt is forward the mag won't seat. When it's back it will seat but when I release the bolt it looks like the bolt is hitting the back of the mag.

Anyone ever have this happen or know what I can do to fix it?


Edit: it's for an ar


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I have some steel 40's that did the same thing. I went at them with a Dremel and took 1/16" off the lips and they work great now.
 
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