MEMPHIS, Tenn. — Twenty-six people in Tennessee recently have been convicted or face charges for possessing cheap, easy-to-obtain devices known on the street as switches that convert semi-automatic firearms into a machine guns, federal law enforcement officials said Monday.
The devices, which are easily fitted into a semi-automatic weapon, can be made with 3-D printers or even bought on the Internet, a Chicago Sun-Times / WBEZ investigation last year found.
