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the only way i can see this done being that you can't really add aluminum back on, is to sand blast the whole receiver, and slap on some JBweld to thicken the area you want engraved. then you would have to find a way of clamping the receiver down, making sure that it is perpendicular to the table of the engraving machine (a CNC Mill). once the milling is done, powder coat and enjoy.
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Weapons Technician / Gunsmith
Don't look at me, I don't know, lol ¯\(°_o)/¯.
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