Ambrose E. Burnside resigned from the Army in 1853 to manufacture his carbine. He joined the Bristol Firearms Company of Bristol, Rhode Island. More than 43 cavalry regiments were equipped with this weapon during the Civil War. At the outbreak of the war Burnside rejoined the service, ultimately becoming one of the more maligned generals of the war.
Drawing of Improvement in Breech Loading Firearms, 03/25/1856