Hey guys, I just bought a new to me shotgun (somewhere around 1978 make). Love this shotgun, except for one problem. The roll marks and serial number are shallow as hell. Being as I am going to be refinishing this gun, I wanted to deepen the markings and serial number. Is this legal? Would this be considered "modifying" the markings? I have already tried to contact the ATF regarding this issue, but no reply. I just don't want to go through the trouble of refinishing it, only to realize the numbers are gone. I still have a bit of time before I really get started on the metal work and all but any help would be greatly appreciated.