The devices, sometimes referred to as Glock switches, enable handguns to act like machine guns, firing more than one shot with a single pull of the trigger.

I have not seen a single episode of World Trigger; I was too busy watching real men’s shows like Oreimo and School Days, which makes me perfectly eligible to write about this game. Anyway ...

Those devices, some called "Glock switches," can be installed on handguns to automatically fire more than one shot, without manual reloading, by a single pull of the trigger.