The LeMat revolver was a .42 or .36 caliber cap & ball black powder revolver invented by Dr. Jean Alexandre LeMat of New Orleans, which featured an unusual secondary 20 gauge smooth-bore barrel capable of firing buckshot. It saw service with the armed forces of the Confederate States during the American Civil War of 1861–65.
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.
LeMat Revolver in The Guns of the SouthEdit
General Jeb Stuart was so taken with the new AK-47 repeating rifles that he sold his LeMat revolver. On being told this, General Robert E. Lee immediately understood just how effective the new rifles were since Stuart had been carrying the fancy revolver since the war was young.