A little emery cloth will take care of the microstamp No one will be able to tell if it has been done or not, unlike filing off a serial number which can be easly seen and chemicaly restored.
Why even bother. The only thing the microstamp will show is who the gun was stolen from. These guys are dumber than they look.
Owning a firearm modified in this manner would be an additional felony. I am sure that all respectable felons will realize this and shun such modified firearms.