The Zastava M51 was a Yugoslavian prototype submachine gun from the 1950s, designed as a more compact alternative to the M49. It features a hybrid bolt design, a collapsing metal stock, and uses PPSh-41 style magazines chambered in 7.62x25mm Tokarev. Despite its innovative features, it never entered production, with only a few examples surviving today. The M51's design elements were influenced by both Soviet and Italian submachine guns.
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