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The guys head to Houston to fire off a German MG-42 machine gun from World War II. Known as Hitler's Buzzsaw, the MG-42 fired 1,200 to 1,500 rounds per minute and killed thousands of Americans in Normandy. Then, Hammer uncovers a Civil War story that could rival "Gone With The Wind." A man brings in a collection of 42 letters that describe the gritty details of daily life for a fighting man. The seller paid $600 for the letters and is hoping to get $3,500 at auction.