Odd. Just not seen a good stainless gun have any rust. I must keep my guns way too oily.....
I have an old .22 revolver that is nickel and it has some tarnish from age. No rust there either.
CM, in the trade we have a vulgar name for people who can rust stuff, **** finger. Some guys (and I assume women too) can rust anything they touch, others never have a problem. Not sure if that is the case here or not, but even fairly good stainless can rust.