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I've had a couple of my older mag get some light surface rust on them from my fingerprints, just by leaving them in my safe for a couple of days after a range session. It wiped right off with some oil, but I couldn't believe how quickly they rusted. I keep a light coat of oil on all my mags now and I haven't had a problem since. This issue seems to be sporadic, as only a few mags in my collection seem to rust.