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If it is rubbing off from say an MP5 series, you might be able to track down an ICS lower receiver which offers deeply engraved fire selector icons and I believe are TM compatible. However that is pretty much the only option for that particular gun. The G36 series or other HKs, metal body armalites or custom metal bodies, the only way to preserve them is to perhaps cover them with a layer of clear tape, but that looks a tad bit ugly.
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