This carbine was originally a U.S. Model 1873 Springfield trapdoor carbine and was converted in the period into a repeating carbine by installing a tubular magazine under the barrel and modifying the breech mechanisms so that opening and closing the breech also operates an elevator to ready the next shot. A switch in the "arch" of the breechblock allows the shooter to manually load single shots and then switch over to the magazine if necessary. The carbine has a blade front sight, standard rear sight, "MODEL/1873/eagle head/crossed arrows/US" on the breechblock, "R/117" in place of a normal serial number, "U.S./SPRINGFIELD/1873" and the spread wing eagle motif on the lock which has a three-click tumbler, no front lock screw or front trigger guard screw due to the magazine mechanism, sling ring on the left, and "US" marked buttplate. The design has been attributed to A. Sheridan Jones (first initial sometimes listed as "J" in records) of Menno, Dakota Territory, around the time of the 1882 rifle trials. He was born in Missouri in 1840, fought in the Civil War, moved to the Dakota Territory in 1872, served as the territorial auditor in 1874-76, was a member Dakota Territorial Council in 1885-86, served as superintendent of public instruction in 1885-1887, and died in 1893. The design he presented at the rifle trials appears to have been somewhat different and to have fed through the butt based on the details given in the "Annual Report of the Secretary of War, Volume 3" from the United States War Department.