I dont know of any website that does it, but if you are just wanting to fill in the engravings on the gun you can do it your self. Do a search for crayon, there are a few pretty good write-ups on how do do it with a crayon and a lighter. The pics Ive seen look pretty good!
Someone suggested this site to me for some custom etching, Lone Wolf Distributors - Products - Laser Engraving
Haven't used them yet, but it seems very reputable. I've seen their work posted around, and I'm debating having them etch PRP's logo onto the slide of my XDm.
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