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For what rifle? Where both are pinned to five rounds I can't see how there'd be a lot of difference in reliability. The only tapco mags I've used are the ones for the Sks 5/20. They've worked fine for me after some initial fitting. Not sure if they make a 5/30 for Sks.
I've never tried their AR or mini14/30 mags. So can't help you there.