Hello Conley, The prefix is CR serial # 12XXX and the slide and frame are a satin finish, almost resembling a satin hardchrome surface. The gun is definitely not the dull brushed (mottled) stainless surface that I've seen on many MK V pistols. And as I said previously it does have the windage adjustable rear sight with allen screw retainer.

Would you know of anyone selling original magazines? I'm not interested in the aftermarket types. Perhaps I should just wait for DETUSA to begin offering
replacements!

Thanks for the help