Yes, even stainless will rust, just not near as quickly or easily as most blued rifles. I too prefer a black scope with my stainless rifle. Since most scopes are made of aluminum you don't really have to worry about them rusting, but the rings sure will! Since I neglect my rifle more than I should that's the one spot I have to watch for rust. Most of the rust I see on my rifle is in areas like between the stock and metal where moisture can be held. Unlike my blued guns if it gets wet during a week of hunting I won't take it apart to clean, just leave it in a shop overnight where a wood stove is burning and that sucks all the moisture out of the rifle. I'll then clean it thoughly after the week of hunting. My blued guns had to be cleaned and oiled immediatly after coming in from the rain else they'd start to rust.

One other note about stainless is they are not as strong as blued. Not quite sure how that would affect anything, maybe shorter barrel life (5,000 rounds vs 10,000 - totally making those numbers up though). I'm sure someone else has more info on that aspect as I'm not metallurgist.