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The Winchester Machine Rifle, WWI's Anti-Balloon Assault Rifle
One of several interesting automatic individual weapon designs from World War I, the Winchester Machine Rifle was a concept for a dual-purpose anti-observation-balloon/ground weapon that featured several concepts that, for better or worse, were definitely ahead of their time. Matthew Moss of the Historical Firearms Blog posted an excellent overview of the Winchester Machine Rifle, both there and on WarIsBoring:
