there's nothing that"eats" a blued gun quicker than a salt water environment- since stainless was unavailable at the time( they hadn't yet started to use it for gun making material because of the galling) the only 2 options were blue and nickel- at least as far as colt is concerned- parking is/was only available to a very few-or came on military/exmilitary( read us military) guns- i learned a long time ago that unless you keep a blued gun slightly "wet" in some environments it'll rust, no matter what you do- overnite, sometimes- so you clean and oil BEFORE you go to bed- that's the reason i've got a nickel- however, the sights are blued- blue/blackened sights are a pretty well got to have- the nickel.stainless will glare under certain conditions