The 500 Waterfowl in 20 gauge with Mossy Oak camo and a 28-inch ported barrel for waterfowl use. Modern non-toxic shot loads in 20 gauge are effective on ducks at 25-35 yards, making the 20-gauge waterfowl gun a viable option for hunters who prefer less recoil. Type: Shotgun Action: Pump-Action Caliber: 20 Gauge Capacity: 5 Year introduced: 1993, USA Weight: 96 oz Overall length: 48" Status: Active Intended use: Waterfowl, Duck Hunting