Military-configuration Model 12 with 20-inch cylinder bore barrel, heat shield, and bayonet lug. Issued as the Model 12 Trench Gun during World War I and World War II, it saw extensive combat in both conflicts. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 5 Year introduced: 1918, USA Weight: 7.5 oz Overall length: 40.5" Status: Discontinued Military use: Yes Intended use: Military