The Springfield Trapdoor is a type of rifle that was widely used by the United States military in the late 19th century. Officially known as the Springfield Model 1873, it featured a single-shot, breech-loading mechanism that allowed for quicker reloading compared to earlier muzzle-loading rifles. The design was notable for its distinctive trapdoor mechanism, which opened to allow the insertion of a cartridge. This rifle was chambered for the .45-70 Government cartridge, making it powerful and effective for various military applications. The Springfield Trapdoor played a significant role in conflicts such as the Indian Wars and the Spanish-American War, and it remains a popular collector's item today.