The Spencer repeating rifles and carbines were 19th-century American lever-action firearms that were invented by Christopher Spencer. The Spencer was the world's first military metallic-cartridge repeating rifle, and over 200,000 examples were manufactured in the United States by the Spencer Repeating Rifle Co. and Burnside Rifle Co. between 1860 and 1869. The Spencer repeating rifle was adopted by the Union Army, especially by the cavalry, during the American Civil War but did not replace the standard issue muzzle-loadingrifled muskets in use at the time. Among the early users was George Armstrong Custer. The Spencer carbine was a shorter and lighter version designed for the cavalry.
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^Esposito, Gabriele, Armies of the War of the Pacific 1879–83: Osprey Publishing (2016)
^Cite error: The named reference Argentina was invoked but never defined (see the help page).
^Walter, John (2006). The Rifle Story. Greenhill Books. pp. 256, 70–71. ISBN978-1-85367-690-1. The fire-rate of the Spencer was usually reckoned as fourteen shots per minute. The Spencer rifle with a Blakeslee quickloader could easily fire twenty aimed shots a minute