This article originally appeared on Arizona Republic: 3D printing makes dangerous 'Glock switch' devices easier to get, ATF ...

A small switch ... 3D printed at home can convert one of the most popular handguns in America into a weapon with machine gun-like power. And while the handgun modification uniquely affects Glock ...

A Glock switch is a small, often 3D-printed or metal device that can be attached to the rear of the firearm’s slide, enabling it to fire continuously with a single pull of the trigger ...

Also known as “auto switches,” the devices, which are already illegal in New Jersey and some other states, can be bought for about $20 or 3D-printed, and are about the size of a small Lego brick.