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Mag catch seats the mag too low. The hop-up doesn't push the retaining clip in the mag releasing the bbs. You can either tape (or glue a piece of plastic) the top of the mag catch or the top of the groove where the catch sits in. Shaving the mag lip will work if the lips are longer than the lip of the hop-up. But in this case the mags just aren't seated "in" enough for the hop-up lip to release the bbs.
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