Abstract: A handheld firearm such as a standard revolver adapted to dispense a debilitating chemical substance through the butt end, whereby in the shank there is a fixed or detachably mounted butt end comprising a reservoir of the debilitating chemical, such as Chemical Mace or teargas, under pressure. Valve means for dispensing the repellant is actuated by depression of a button located on the detachably mounted butt end portion of the shank, below and out of the way of the hand grip, for operation by the last digit. The presence of the reservoir of the repellant as the mounted butt end of the shank portion of the gun allows for operation without interference with a strong hand grip, avoids accidental lethal firing of the weapon, when detachably mounted permits fast recharging in the event the reservoir is depleted or in the event that there is a mechanical failure of the discharge system.