nitrox, what are you talking about man, nitrousOXIDE is a compound of oxygen and nitrogen, not a mix. nitrous oxide is nox, and that burns big time.
oxygen will also NOT burn on it's own, it just makes anything that's already burning around it to burn a lot better, caus it's whatever material combining with oxygen that is buring (hope i'm still making sense)
most guns are made from aluminium, and that doesn't corrode (well it does, but as soon as it starts it stops) stainless steel also doesn't corrode, hence it being stainless.