Jay Harris of champion defense says a Glock Switch can be made with a 3D printer for virtually no cost. The firearms instructor says it is very simple to use one to make a semi-automatic handgun ...

A Glock switch, also known as an auto sear or machine gun conversion ... A Glock switch is a small, often 3D-printed or metal device that can be attached to the rear of the firearm’s slide ...

“For decades, Glock ... a switch. 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 ...