Take your mag catch out and see if the mags drop free. Chances are, the mag catch is traveling too far, and restraining the mag. You can buy an over-sized mag catch lock from Brownells, carefully fit it, and that should cure your issue.
Back in the ol' days, we would carefully cut a short piece of round stock that would fit inside the mag catch spring, and trim it so you could just turn the lock to retain the mag catch.
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