Relating to the prosecution of the criminal offense of the possession, manufacture, transport, repair, or sale of a machine gun or a machine gun conversion device.

HB 4216 amends Texas Penal Code to criminalize the possession, manufacture, transport, repair, or sale of machine guns or machine gun conversion devices, with specific exceptions for items registered with federal authorities or classified as curios/relics by the U.S. Department of Justice. The bill directly affects individuals who handle these firearms or devices without meeting federal registration or classification requirements. Key provisions define "machine gun conversion device" and establish that possession of such devices is unlawful unless the item is federally registered or classified as a curio/relic. The law would take effect September 1, 2025, applying only to offenses committed after that date.