An ATF official fires a semi-automatic gun that has been modified using a a 3D printed gun conversion device that enables a lawful semi-automatic firearm to become an illegal fully automatic firearm with $0.40 worth of plastic, in a test firing range at the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) National Services Center in Martinsburg, West Virginia, September 4, 2024. (Photo by SAUL LOEB / AFP)