This is a tough one since the fix would be to add, rather than remove material from the top of the magazine body's mag catch cut-out in this case.
If lock up is solid, it is not the magazine catch's spring. If you feel the investment worth it, you might purchase a new magazine release and see if it solves the problem. A mag release with slightly more material on the top of the catch would seat the magazine higher. G. T., our resident magazine expert may have more ideas.
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