Credit: AP/Alex Brandon A Glock switch is one type of a machine gun conversion device. It's a metal or plastic piece, about the size of a coin, that attaches to the back of Glock pistol ...

Some are used by backyard gun enthusiasts. Others are used by criminals. A Glock switch is a gadget about the size of a thimble that can be plugged into the back of certain semi-automatic handguns ...

Gun Owners of America, another gun-rights group, contends people should have a Second Amendment right to own machine guns. State laws against machine gun conversation devices are “duplicative” and ...