U.S. Springfield "Model 1878" Trapdoor Rifle - .45-70 Govt Up for sale is a stunning piece of late 19th-century American military history: an antique U.S. Springfield "Trapdoor" Rifle in .45-70 Government. Famous for its hinged breechblock that flips open like a trapdoor, this rifle was the backbone of the U.S. military during the Indian Wars and westward expansion. Whether you are a dedicated collector of Americana, a historical reenactor, or a shooter looking to experience the iconic .45-70 black powder cartridge as it was originally meant to be fired, this rifle is a magnificent find.