You need to be a bit more specific as to exactly what you'd like to accomplish.
Overall the easiest thing would be to electro-etch. There's alot of video's on youtube showing similar but slightly different techniques. ( I'd offer a slightly more informed opinion but the UPS guy hasn't shown up with my stencils yet ).
Well I have been doing a little more research and it is looking like there is no easy answer. So I need to be able to make an indention so that even once I Cerakote the barrel the mark will still show. I was hoping to find a something simple but it doesnt look like thats a thing.
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