Sleeved XP100s

[gunsandgunsmithing]

Pita, but remove the sleeve, mill a slot and re glue it. Mfg and their address should also show. Fwiw

 

[gunsandgunsmithing]

Just thinking outside the box here. With the new ATF regulations regarding unmarked guns. If an ffl takes into possession a firearm that is unmarked he is supposed to not return it to the owner until it is marked with a serial number. This might be way into any gray area of the regulations, but couldn't he just mark it with his own serial number like it was a personally made firearm.

Serial numbers weren't required by law until 1968