Hey guys I know this is an older thread but I just got a call back from ATF on possibly relocating the serial number on my Beretta 1301 to do a loading port mod, well it was a simple sorry NO you cant. I even asked if I re engraved it on the CNC mill and took photos of it with the old number still intact would that work? NO NO NO so there you have it NO you cant and yes a few of the modified ones pictured here are illegal in the USA