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Marlin-Browning Mark 5. $41,500 Extremely rare belt-fed Navy gun, successor to -- but more reliable than -- the more common Potato Digger. Hobart (Pictorial History of the Machine Gun) says "It is of interest to note that this gun was modified by Carl Swebelius of the Marlin Rockwell Corporation and the swinging arm was replaced by what is now considered an orthodox gas piston". In fact, this is the first machine gun ever to use modern gas recoil operation.
