In addition to their semi-automatic handguns, Glock also produces a select-fire pistol, the Glock 18, which is able to be fired in either semi-automatic or fully automatic mode. This model is generally available only to law enforcement or military organizations and the details of its production are seemingly classified. Conversion kits for other Glocks to be fired in fully automatic mode also exist, but they are third-party, and they are specifically marked as Title 2 devices by the U.S. Bureau of Alcohol, Tobacco, Firearms, and Explosives – restricting their purchase and possession to ATF 3 license Dealers in the US.