The Springfield Model 1868 was one of the rifles which used the trapdoor breechblock design developed by Erskine S. Allin. == History and design == Originally, the trapdoor Springfields were created to convert Springfield Model 1861 and Springfield Model 1863 rifled muskets to breech-loading rifles at a relatively low cost.
The Springfield Model 1868 was one of the rifles which used the trapdoor breechblock design developed by Erskine S. Allin. == History and design == Originally, the trapdoor Springfields were created to convert Springfield Model 1861 and Springfield Model 1863 rifled muskets to breech-loading rifles at a relatively low cost.
Source: Wikipedia "Springfield Model 1868" · CC BY-SA 4.0
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