Rollin White was an American gunsmith who invented a single shot bored-through revolver cylinder that allowed paper cartridges to be loaded from the rear of a revolver's cylinder. Because the open breeches were unprotected from lateral fire, all charges would instantly explode in a chain fire. Only one gun would be built to White's specifications, and that for use in a trial to show the impracticality of the gun. The gun could not fire metallic cartridges.

A revolver is a repeating handgun that has at least one barrel and uses a revolving cylinder containing multiple chambers for firing. Because most revolver models hold up to six cartridges, before needing to be reloaded, revolvers are commonly called six shooters or sixguns. Due to their rotating cylinder mechanism, they may also be called wheel guns.