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Springfield Model 1888, trapdoor mechanism open

In firearms, a trapdoor is a form of breech-loading mechanism for rifles in which a hinged breechblock rotates up and forward, resembling the movement of a trapdoor.^[1] The Springfield models 1865 and 1873 were best known for first employing this type of action.^[2]

^ "The Springfield Model 1873 Rifle – The Campaign for the National Museum of the United States Army". armyhistory.org. Retrieved 2017-05-11.
^ "Evolution of the Breechloader - Springfield Armory National Historic Site (U.S. National Park Service)". www.nps.gov. Retrieved 2017-05-11.