Re: question about a finish
Plating will cost considerably more than bluing and polishing needs to not only get down to bare metal but take into consideration tolerances as well since plating adds more metal than polishing removes. For example, it is very common to have to polish and file slide rails down before plating, otherwise the slide can't be installed after the plating is done. The same applies to such areas as revolver sideplates and cranes.
If you choose plating, make sure you have the work done by a gun shop that specializes in plating (or a plater who specializes in guns); folks who do ordinary metal plating usually don't have the experience to do guns right.