Relating to the definition of firearm for purposes of certain criminal offenses.

HB 3669 amends Texas' Penal Code to clarify the legal definition of "firearm" for criminal offenses. It specifically excludes antique/curio firearms manufactured before 1899 and their replicas (if they don't use rim/center fire ammunition), as well as "less-lethal projectile devices" like rubber bullets designed to temporarily incapacitate targets with minimal injury risk. The bill creates a new definition for "less-lethal projectile device" in Section 46.01(21). These changes apply only to offenses committed on or after September 1, 2025, with prior offenses governed by older law. The bill focuses on defining what constitutes a firearm under criminal statutes, not altering penalties.