I was told about Birchwood Casey products some time ago by Triple Se7en.His advise was as usual, top shelf stuff. He advised that this was some excellent product and that I might want to look into it. I started using Sheath for protecting the barrels and have never looked back since. It is my #1 rust preventative. After that I fall back to Break Free CLP and Rem Oil. Both of them are also outstanding. I do reach for the Sheath though, and use it in my center fire rifles and handguns as well.

As for bluing back spots, Brownell and Birchwood Casey make a bluing product. I have never used them but have read other posts about people who have. They claimed the directions were easy to follow and the results were very good. I guess that is where I would look if I were in your shoes.