The Fenian Needham Conversion transformed muzzle-loading muskets into breech-loading cartridge rifles for the Fenian Brotherhood's attempts to invade Canada. Developed at the Pioneer Arms Factory, these conversions featured a side-pivoting breech block and were chambered for .58 centerfire, with loose tolerances allowing .577 Snider ammunition. Despite their modernization efforts, the conversions suffered from extraction issues, contributing to the failure of the 1870 invasion.
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