Finally got around to doing mine. Desert sand and fluorescent green.
Here is mine, did it with silver nail polish. I can still see residue on the slide from the silver. I don't know whether to keep rubbing nail polish remover on it or just leave it figuring it will wear off when I carry it. The letters themselves filled in great as I probably used 4 coats.
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If it comes off with gun oil, won't the stuff in the lettering come off too?