I only color my own guns but control over the colors is not necessarily always possible. I feel that I am close to that of factory as I have or have had many in factory new condition to compare but with that being said the factory had colors that were not always consistent. There is a big name in color case hardening that does fantastic work but as for me thinking they appear factory I do not. There are several that are LC Smith experts that if you do a search on this forum that do what appear to me factory colors. In fact one of them helped me work out some of my kinks in coloring.