Tennessee Bureau of Investigation - As introduced, requires the bureau to compile and maintain information on any available serial numbers on firearm parts that were used to a make a firearm that does not contain a serial number or other mark in a manner that conforms with federal requirements and that was used in an incident of mass violence or possessed by a person who threatened to commit an incident of mass violence. - Amends TCA Title 38 and Title 39, Chapter 17, Part 13.