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Springfield Model 1866 breech. The Springfield Model 1866 was the second iteration of the Allin-designed trapdoor breech-loading mechanism. Originally developed as a means of converting rifle muskets to breechloaders, the Allin modification ultimately became the basis for the definitive Springfield Model 1873, the first breech-loading rifle adopted by the United States War Department for ...
The Model 1868 was also the first trapdoor conversion to use the cartridge extractor covered by U.S. Patent No. 68,009, issued August 27, 1867 to W.H. & G.W. Miller. The Model 1868 had an overall length of 51 7 ⁄ 8 inches. [1] Over 50,000 Model 1868 rifles were manufactured, chambered for the .50-70 450 cartridge.
These modifications cost about $5 per rifle (around $97 adjusted for inflation), which was a significant savings at a time when new rifles cost about $20 each (around $387 adjusted for inflation). Patent No. 49,959 was issued to Erskine S. Allin on September 19, 1865, describing the design.
The Model 1873 was the fifth variation of the Allin trapdoor design, and was named for its hinged breechblock, which opened like a trapdoor. The infantry rifle model featured a 32 5 ⁄ 8-inch (829 mm) barrel, while the cavalry carbine used a 22-inch (560 mm) barrel.
Springfield Model 1870 (center) The Springfield Model 1870 was one of the rifles which used the trapdoor breechblock design developed by Erskine S. Allin. The Model 1870 was a minor improvement to the Springfield Model 1868, and retained most of the Model 1868 rifle features.
Drawing from Erskine S. Allin's patent for the Springfield Model 1865's trapdoor mechanism. 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. The hinged breechblock caused these rifles to be named "Trapdoor ...
An ATF report on guns used in crimes found that the number of machine gun conversion devices seized by law enforcement went up 570% from 2017 to 2021, and officials say preliminary numbers from ...
Originally, the trapdoor Springfields were created to convert Model 1863 Springfield rifled muskets to breech-loading rifles at a relatively low cost. The Model 1869 Cadet Rifle was a shortened version of the Springfield Model 1868. It had a 29.5 inch barrel, compared to the 32.5 inch barrel of the Model 1868, and had an overall length of 48.8 ...