I own several 40 to 50 year old rifles and shotguns which are blued, not of them exhibit any rust. All you have to do is regularly clean and lightly and I mean lightly lubricate the metal parts of the firearm. As for me, I do not care for stainless steel barrels and actions on rifles for hunting or synthetic stocks, to each his own. A properly cared for blued barrel and action will last and be useful for several lifetimes. I do however own several stainless steel handguns. If you do buy stainless, they need the same maintenance as blued firearms. Here is an 8mm Mauser I sporterized and cold blued 46 years ago as a gift for my brother. It still looks this good today as them photos were taken last year.