The only magazines that I have had trouble with over the years are cheap Chinese replacements. Most of them are OK for fooling around with... but sometimes it is not that great of an idea to save a few bucks on something that could fail at a critical moment. Some of them are easily damaged by normal handling and some just are screwed up to begin with.
The WORST magazines I ever ran across were Keltec PMR30 makes. Cheap little THIN springs that were already corroded or rusted. I guess in the scheme of things it was likely. The gun was a cheap, loud plastic piece of crap, too.