Crime Roxbury men charged with selling 3D-printed devices that turn guns into automatic weapons So-called "Glock switches" allow guns to fire multiple rounds with a single pull of the trigger.

Where do they come from? Officials said switches are illegally imported from overseas or 3D-printed locally. Because the devices can be made from plastic on a 3D printer, it means the files to ...

According to the Bureau of Alcohol of Tobacco and Firearms, devices that turn handguns into machine guns are being found more often in metro Phoenix.