A Glock switch or Glock auto-sear is a small device that can be attached to the rear of the slide of a Glock handgun, converting the semi-automatic pistol into a machine pistol capable of fully automatic fire. As a type of auto sear, it functions by applying force to the trigger bar to prevent it from limiting fire To one round of ammunition per trigger pull
The device demonstrated Wednesday allowed the handgun to empty a 30-round magazine in about two seconds − two to three times faster than pulling the trigger for each round. Using the devices makes shootings more deadly.
Glock switches are a Stainless steel attachment that can be put on the back of a Glock semiautomatic pistol. With the device attached, the gun can fire continuously with one pull of the trigger.