In the versions of legislation that I've seen, messing with the micro-stamping is a crime. So if you have a gun whose paperwork indicates that it was micro-stamp when sold, and the micro-stamping is now illegible (whether from filing it off, or just normal wear), then you are in trouble.
To the gun grabbers, the value of this is that it provides yet another way to give legal troubles to gun owners.
“In the versions of legislation that I’ve seen, messing with the micro-stamping is a crime.”
Yes, and criminals wouldn’t commit a crime like that...murder, maybe, but NOT filing a microstamp in violation of the law!
This is just another plan to harass the innocent while letting the guilty do as they please.