At the end of the Civil War, the US government had a surplus of outdated muzzle-loading firearms but also a surplus of debt, so Springfield devised a method to convert the 1863 rifles to breech-loaders. Rifled modified in this manner are referred to as Allin Conversion models or sometimes the Model 1864. The conversion method involved milling the breech and attaching a trapdoor mechanism. By doing so and after sleeving the barrels, the rate of fire increased from three to four rounds per minute up to eight to ten. This rifle features a blade front sight and an adjustable aperture rear sight. Its wood and bore are in good condition and its metal is fair condition.