John Browning's exposed-hammer pump shotgun, one of the most commercially successful shotgun designs ever. The hammer-fired action allowed hip-shooting without chambering a round first. In WWI, the "Trench Gun" variant with heat shield and bayonet lug so terrified German troops that Germany formally protested its use as inhumane — the US ignored the protest. Over 1 million produced between 1897 and 1957. Type: Shotgun Action: Lever-Action Caliber: 12 gauge Capacity: 5 Year introduced: 1897, USA Weight: 100 oz Overall length: 47.5" Status: Discontinued Military use: Yes Intended use: military, hunting, civilian