Hey truevil, apologies, I didn't see this. I know that H&K makes a solid stainless steel and hard chrome slide guns. I think the chrome would be a better finish, shows less wear and would shine up nicely, but I have no explanation as to why the SS would not shine up as bright. Below is a .45 H&K with a SS slide and a .40 H&K with a chrome slide.
"There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter." - Hemingway
The greatest ignorance is to reject something you know nothing about.