THere was a time when removing the serial number was legal just as removing it from your TV would be legal today. If it was done at that point I can not believe any .gov would prosecute you for the offense unless you were otherwise legally entangled. I would bet such a firearm is legal. The burden of proof would lie on the .gov as far as proving when/who ground it off. Good luck.
I think...
The acid only works if you barely file the numbers off. If you take a bit of extra material off the acid isn't going to do crap. or if you re-etch the area and regrind. Not something I have looked into. Easier to just change barrels anyways...
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