Manufacturer: US Arsenals
Where made: Springfield (MA), Harpers Ferry (VA)
Year(s) made: 1856-1859
About 250,000 Model 1842 Springfield single-shot muzzleloading smoothbores were made before 1856, at which time the US Army began rifling some of them. About 14,000 were converted by 1859. The .69 caliber rifle was found to be less accurate than the new .58 caliber rifles, however, and further rifling was halted.
Employment at Sharpsburg
At least 1 Federal regiment, the 81st Pennsylvania, used this weapon.
Maximum: 500 yards; Effective: 300 yards
Overall: 58 inches; Barrel: 42 inches
Specifications from the Springfield Armory NHS.