No rust on mine, if you are in a very corrosive environment I suppose anything can rust but that is not my experience at all. If he is that sweaty that he is rusting it out. then he should go with a glock. The design fits more rounds into a compact magazine that I've encountered in any other design, not sure if aftermarket magazines can match it.I read a report by one owner, that the factory mags rust almost immediately - don't know, maybe he lived in Lousiana & took it gator hunting every day. One thing to watch for, though, and hopefully there will be quality aftermarket mags (Mec-Gar?) available at some point.