![]() The Springfield model 1865 fired a rimfire. This caused the Model 1865 to be called the "First Allin", and the following revised model, the Springfield Model 1866, to be called the "Second Allin". Therefore, before the Model 1865 production order was completed, a less complex rifle was already being tested. It soon became apparent that many of the small working parts in the breech system were not going to have a long service life, and the action was too complicated for normal service use. The hammer nose was flattened to accommodate the firing pin.Īpproximately 5,000 Civil War Model 1861 rifled muskets were converted at the Springfield Armory in 1866. The firing pin was housed within the breechblock. The rack-type system extractor was withdrawn automatically as the breechblock was opened and snapped back at the end of its stroke. A thumb-operated cam latch at the rear of the breechblock held it shut when in closed position. ![]() ![]() The conversion from musket to breechloader was done by milling open the barrel's breech section and inserting a hinged trapdoor fastened to the top of the barrel. The hinged breechblock caused these rifles to be named "Trapdoor Springfields". The trapdoor mechanism employed a hinged breechblock that rotated up and forward, resembling the movement of a trapdoor, to open the breech of the rifle and permit insertion of a cartridge. Allin's patent for the Springfield Model 1865's trapdoor mechanism.
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