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By rust, do you mean surface rust? If so, that can be kind of normal with anything they have that is blued. My P-11 got surface rust on the slide and the top of the barrel a few days after I purhased it (a few years back). I don't live in a humid environment by any means, its just plan hot here, so I was a bit suprised and miffed over it. Ended up just cleaning it off with some CLP and it all came off with no issue. Interesting fact, was that I wasn't carrying it when it rusted. It was just sitting in a drawer when it happened.

Since then, I haven't had any rust appear on it, and I carry it IWB daily. I doubt the finish on mine is that different, but rather I think my body just has a different PH that isn't as prone to causing rust. The one time I called up Kel-Tec the were very very helpful (sent me the part I needed free of charge) and polite. I certainly hope they take care of you.

Hope everything works out to your liking! :)