Imperial Guard Storm Troopers normally wear a large backpack which contains the separate power source required to provide the increased damage output for both Hellpistols and Hellguns. Like the standard Lasgun, the Hellgun can operate in either a semi-automatic mode, where it fires one shot per trigger pull, or as a fully automatic weapon in which it unleashes a continuous stream of laser fire for as long as the weapon's trigger is depressed. The Hellgun shares the same technology used in the Hellpistol. The standard pattern of Hellgun currently used in the Imperial Guard is the Hellgun Mark II, which is gyro-stabilised and requires the use of the backpack-mounted power source to be effective.