The Springfield Model 1866 was the second iteration of the Erskine S. Allin designed trapdoor breech-loading mechanism. Originally developed as a means of converting rifled 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 manufacture and widespread issue to U.S. troops.
The Springfield Model 1866 was the second iteration of the Erskine S. Allin designed trapdoor breech-loading mechanism. Originally developed as a means of converting rifled 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 manufacture and widespread issue to U.S. troops.
Source: Wikipedia "Springfield Model 1866" · CC BY-SA 4.0
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