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While the market abounds with strange models of firearms, particularly those intended for various military applications, few sights are stranger than that of the familiar M1 Garand firing fully automatic bursts of 7.62x51 mm. This however, is exactly the case with the Beretta BM-59E, a series of M1 Garands sent to Italy for conversion by the Argentine military. For more on this esoteric rifle, 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.