Elite Trophies in Norman does the decorative engraving for Norman PD retirement gift guns. And they worked with me to get engraving on a piece of hard anodized 7075-T6 aluminum as deep as I wanted it. They won’t guarantee NFA depth (and I didn’t need it), but I believe their equipment would probably be capable of it if they could figure out what settings to use. Not sure if they have an FFL.
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