These rifles were called the Model of 1865, but unfortunately the. 58 rimfire cartridge loaded with a 480-grain bullet and 60 grains of black powder. The first trapdoor Springfields were 5,000 muzzleloaders chambered for a. Alexander Dyer, Chief of Ordnance, but Allin assured the general the Army could use his design without paying royalties. Allin personally patented his system in 1865, unbeknownst to Gen. His design removed a few inches off the top of the rear end of the barrel the gap was then fitted with a steel breechblock hinged at the front (hence the nickname “trapdoor”) containing an angled firing pin. Allin, master armorer at Springfield Armory. Several people came up with workable conversions, but the winner was developed by Erskine S.
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