The distinguishing characteristic of LeMat's revolver is that its 9-shot cylinder revolves around a separate central barrel of larger caliber than the chambers in the cylinder proper. The central barrel is smooth-bore and can function as a short-barrelled shotgun (hence the name "Grape Shot Revolver") with the shooter selecting whether to fire from the cylinder or the smooth-bore barrel by flipping a lever on the end of the hammer. Flipping the lever up caused the movable striker to fall upon the primer set directly under the hammer, discharging the lower barrel, while leaving it in the standard position would fire the chambers in the cylinder, much like any other revolver.