TX HB4159

Requires persons who manufacture, assemble, or own unmarked firearms ("ghost guns") to apply to the Department of Public Safety for a unique serial number and permanently affix it to the firearm within specified timeframes (10-30 days depending on circumstances)

Prohibits the sale or transfer of unmarked firearms except to law enforcement agencies, which must destroy any such firearms they obtain

Makes it a criminal offense to possess, manufacture, transport, repair, or sell any firearm containing a component part made with a 3D printer, or to manufacture/possess such 3D-printed component parts

Creates criminal penalties: Class B misdemeanor for violations involving non-handgun firearms, Class A misdemeanor for violations involving handguns; each unmarked firearm constitutes a separate offense

Exempts antique firearms, curios/relics, firearms manufactured before December 16, 1968 (other than handguns), and firearms already serialized under federal law; implementation phases in with manufacturing requirements effective September 1, 2027 and ownership requirements effective September 1, 2028