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WikiPedia: K-50M http://pmulcahy.100megs3.com/submachineguns/vietna... http://www.vietnam-war.info/weapons/ppsh41_sub_mac... http://world.guns.ru/smg/smg109-e.htm https://modernfirearms.net/en/submachine-guns/viet... https://web.archive.org/web/20080725091435/http://...