American Civil War Era, Sharps New Model 1863 Cavalry Carbine .50-70 Government Centre Fire Obsolete Caliber converted from .52 Combustible Cartridge With Lawrene Pellet Lock Converted to by the U.S. Government. Sn - 21852 American Civil War Era, Sharps New Model 1863 Cavalry Carbine .50-70 Government Centre Fire Obsolete Caliber converted from .52 Combustible Cartridge With Lawrene Pellet Lock Converted to by the U.S. Government. Sn - 21852 Single Shot .50 Rifles