Hell-Fire trigger

A Hell-Fire trigger is a device that allows a semi-automatic firearm to fire at a rate approaching that of a fully automatic firearm. The Hell-Fire trigger system is ATF legal. The Hell-Fire installs in seconds and clamps to the trigger guard behind the trigger. It has a "finger" that presses against the back of the trigger. The net effect of this is to increase the force that attempts to return the trigger to its forward position. For operation, the gun is held loosely with the non-trigger hand and the trigger finger held stiffly. When firing commences, the weapon will recoil and the device is pressed against the trigger. The tension arm in the device causes the gun to move forward again, causing the trigger to be pressed against the trigger finger again. The system utilizes the gun's own recoil and inertia. This rapid firing prevents aiming with the sights, making accurate shooting impossible.

Technically, the firearm is not altered. As in all semi-automatic firearms, only one round is fired with every stroke of the trigger.

The Hell-Fire trigger was used, with a pair of TEC-9 pistols, by the perpetrator of a 1993 mass shooting that killed nine people. Separately, David Koresh, leader of the Branch Davidians, reportedly told authorities that he utilized semi-automatic guns with the part installed.

Also see

 * Bump-fire stock