Brand new P3AT 2nd gen, out of the box. Cleaned it, lubed it using some CLP, and been carrying it in the pocket for a week or two. A little bit of humidity combined with my own salty sweat has already brought out a bit of rust in the slide (exterior mostly) and the front of the slide rails. Alas, I bought the gun for a reason, and will not quit pocket carrying. I brought out the bronze brush, wiped everything away, and here we are. The moral of the story is, lube the exterior of your weapon if you are pocket carrying. Also, I have a bit of dark discoloration on the top of my barrel, but it's definitely not rust, and will not brush or wipe away... hints? I'll provide pics if needed. TL;DR Version: Guns rust if you don't oil them. EDIT: Can anyone tell me if the pits are normal in the metal they use? I've got an eye for that kind of thing, and I'm pretty sure it's not caused from a week or so of carry... but I'd think that kind of texture would be very inconsistent as far as slide travel.