Burnside carbine - American Civil War rifles

The Burnside carbine was a breech-loading carbine that saw widespread use during the American Civil War.
The carbine was designed and patented by Ambrose Burnside, who resigned his commission in the U.S. Army to devote himself full time to working on the weapon. The carbine used a special brass cartridge, also invented by Burnside. Pressing the weapon's two trigger guards opened the breech block and allowed the user to insert a cartridge. When the trigger was pulled, the hammer struck a percussion cap and caused a spark; a hole in the base of the cartridge exposed the black powder to this spark. The unique, cone-shaped cartridge sealed the joint between the barrel and the breech. Most other breech-loading weapons of the day tended to leak hot gas when fired, but Burnside's design eliminated this problem.