This little sucker (9 inches is rather short for a rifle) was one of my old favorites. It was sort of a companion piece to the Nichols Pinto (HERE) and Dyna-Mite Derringer (coming soon).
Some Spit-fires came with this cool belt holster. The bullets are like that used other Nichols guns, and used round Nichols caps (pics HERE).
More Cap Guns HERE.