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The police can still extract the number though. They have some cheimcal ( i cant remember the name) that they can brush over the area where the number was. Then it would show the serial number. Something about the different layers from being pressed, and permantly changing the density in the metal of the reciever all the way through the wall.
I have a friend in my troop who was a Chicago police officer and told me the whole process but i've forgot the details.
Just remember, if the numbers where carved into the firearm, then removing the serial number would be permant. If it was pressed in, then it can still be extracted.
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Aqua Regia, or most any mild to strong compound for etching metal, will work to reveal the pressed numbers.
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and.... if you did the opposite? instead of stratching it away, filling it up with molten metal?
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Using an etchant would still reveal them as they can be used to reveal differences in density/hardness/temper as well as make the differences between two metals in the same piece really pop (think of a damascus blade).
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