Although trapdoor rifles were also produced, the 22-inch-barreled .45-70 Gov’t carbines command ... Allin, master armorer at Springfield Armory, perfected a forward-hinged breechblock that ...

45-70 Gov’t “Trapdoor Springfield” rifles and carbines used by U.S. Army ... There were some miscellaneous surplus Civil War-era parts used, such as lockplates, but the receiver, stock ...