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from what I've seen, the SAFE/SEMI/AUTO is deep laser engraved, and the actual trades are laser etched in to the lower after the lower is painted.
If you get it laser etched it wont "rub off" as you have removed material from the lower to create the trades, if you had trades rub off, it was either just laser etched in to the paint and not all the way to the metal, or it was just painted on.
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