This video explores the historical significance of the 1865 First Pattern Allin Conversion, also known as the Trapdoor Springfield. It details how, following the US Civil War, Springfield Arsenal master armorer Erskine Allin developed this innovative breechloading conversion for the vast number of existing muzzleloading rifled muskets. The video highlights its .58 caliber and complex extractor system, noting it as the initial iteration before later improvements and the eventual adoption of the .45-70 caliber standard, which served US forces until the late 1890s.
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