The stainless used in firearms will rust if not taken care of. It is just more forgiving in harsh environments. I have seen rusted Berreta pistols, ruger pistols, Browning Abolts, and Remington 700s just to name a few. Some makers use nickle plated parts in some areas instead of stainless. I dont know about the Abolts but I think the remington 700 had some nickle parts. I think the abolt is a good rifle. I like the short bolt lift or throw. They seem to be accurate and most come free floated. The new XCR from remington is supposed to be stainless with a nickle coating and then some type of ceramic based coating on that. Its supposed to be rustproof. Ive seen some new coatings that are ceramic based that can coat the outside and inside of rifles making them rustproof. I think it is CeraKote. Here is a link

http://www.larsontactical.com/id23.html