2.91 Possession of an Unregistered Firearm (26 U.S.C. Sec. 5861(d)) is a federal offense that involves illegally possessing a firearm that has not been registered under the National Firearms Act (NFL). This includes possessing a firearm that is not registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), or possessing a firearm that was made without the required tax stamp from the ATF. Types of unregistered firearms may include sawed-off shotguns, machine guns, silencers, short-barreled rifles, and destructive devices. Punishment for this offense can vary depending on the type of firearm. Possession of an unregistered firearm is punishable by a fine and/or up to 10 years in prison.