I know this has been discussed before on this forum, but I still have a question. I would like to refinish the slide on my solid black USPc9 to match as closely as possible the finish on my factory original USP45 SS. Right now I'm inclined toward NP3, but I'm not really sure, and I don't have access to real-life samples to compare. One thing I'm sure of, I wouldn't want a flat finish like that found on the FNX-9. What other options are there? What would be my best choice? TIA