The “Pistol-Carbine” was a pattern offered by the Volcanic Arms Company combining a 16 inch rifle-length barrel with a pistol grip and detachable shoulder stock (it could also be had with an 8 inch barrel). This is the rarest major variations the Volcanic, with only about 300 examples made. This particular one was set up with a telescopic sight around the time of its purchase, although we have no information on who did the work or who owned the gun.