|For an overview of grenade launcher models, see Grenade launcher.|
|The following is based on Fallout Tactics and is not canon.|
“Single Shot Grenade Pistol. Heavily modified flare-gun, chambered to fire a 40mm grenade.”
Due to the grenade pistol's rifled barrel, they can no longer properly chamber a flare cartridge, technically making them grenade launchers, and no longer flare pistols.
This weapon is carried by one of three civilians in the Cold Water market.