Real simple, if the magazine isn't flush than you don't have it in all the way. My hunting partners daughter has one that is a little snug and you just have to take that little extra to make sure you get it in. It may break in a little over time or you may look and see if you need to do some trimming on the stock. In other words, give it a real good look over.
You aren't having issues with the 25 round mag which would indicate it's tolerances are a little looser or maybe just the added leverage makes it easier to insert.
LK
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