The Winchester Model 1897 was the first commercially successful pump-action shotgun. Designed by John Browning, it features an exposed hammer and a solid frame. Its lack of a trigger disconnect allowed slam-firing — holding the trigger and pumping rapidly, a technique used lethally in WWI trench warfare. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 5 Year introduced: 1897, USA Weight: 96 oz Overall length: 48" Status: Discontinued Military use: Yes Intended use: Hunting, Military, Collecting