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Take a look at the history of the Army's short-lived lever-action service rifle: the Winchester Model 1895. Yet another brainchild of the legendary John Moses Browning, the rifle's ingenious design was deemed just a little too complicated for field use. For more, check out this "I Have This Old Gun" segment from a recent episode of American Rifleman TV.
Great powers have often used smaller conflicts as test beds for new weapon systems, and also as dumping grounds for obsolete machinery. The Spanish Civil War was one such conflict.