RE: blued vs. Stainless
Contrary to popular belief stainless barrels will still rust. They do offer better protection from the elements than does a blued gun but you still have to clean it if it gets wet and such.
Also remember that just because the BBL, receiver, and bolt may be stainless the inner workings are NOT so if the gun gets wet enough to cause the outside of a blued gun to rust you will still need to take apart a stainless gun and clean the insides cause you can be sure that they will rust.
Aside from that, a stainless barrels bore does not wear as quickly as a chrome molly barrel. So for the guy that shoots hundreds upon hundreds of rounds a year a stainless bbl will last longer.