Firearm Offenses — Material Defined (revised 2014) is a set of regulations published by the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) that defines the various types of firearms offenses and the associated penalties for violations. The 2014 revision provides the most up-to-date definitions and guidelines for firearm-related offenses. It includes definitions of such offenses as illegal possession, illegal sale, illegal manufacture, illegal importation, and illegal use of firearms. The revised version also includes penalties for violations and offers information on the types of firearms that are subject to the law. The types of firearm offenses defined by the revised 2014 version include: 1. Possession of a Firearm by a Prohibited Person 2. Unlawful Transfer of a Firearm 3. Unlawful Possession of a Firearm 4. Unlawful Possession of a Firearm with an Altered Serial Number 5. Unlawful Possession of a Firearm with an Obliterated Serial Number 6. Unlawful Possession of a Firearm with a Defaced Serial Number 7. Unlawful Possession of a Firearm Not Registered or Licensed to the Possessor 8. Unlawful Manufacture of a Firearm 9. Unlawful Sale of a Firearm 10. Unlawful Importation of a Firearm 11. Unlawful Use of a Firearm in the Commission of a Crime 12. Unlawful Possession of an Unregistered Firearm 13. Unlawful Possession of a Firearm with an Expired or Revoked License 14. Unlawful Possession of a Firearm by a Felon or Domestic Violence Offender 15. Unlawful Possession of a Machine Gun 16. Unlawful Possession of a Short-Barreled Rifle or Shotgun 17. Unlawful Possession of an Unconventional Firearm 18. Unlawful Possession of a Destructive Device 19. Unlawful Possession of a Silencer 20. Unlawful Possession of a Stolen Firearm 21. Unlawful Possession of an Explosive Device 22. Unlawful Possession of an Inert Explosive Device. The revised 2014 version of the Firearm Offenses — Material Defined provides updated definitions and penalties for each of these offenses, as well as further guidance on the ATF's regulations and policies related to firearms.