Still reading over Private Trall Sipuel's Enlistment Post
The Model 1873 "Trapdoor" Springfield was the first standard-issue breech-loading rifle adopted by the United States Army (although the Model 1866 trapdoor had seen limited issue to troops along the Bozeman Trail in 1867).
The gun, in both full-length and carbine versions, was widely used in subsequent battles against the American Indians (Black Hills War, Indian Wars, Spanish-American War, Philippine-American War)
The Model 1873 was the fifth variation of the Allin trapdoor design, and was named for its hinged breechblock, which opened like a trapdoor. The infantry rifle model featured a 325⁄8-inch (829 mm) barrel, while the cavalry carbine used a 22-inch (560 mm) barrel.