This is a Mossberg Shotgun: Pump Action known as the 500 chambered in 20 Gauge, model # 54157, UPC 015813541572
Model Series: 500
Gun Type: Shotgun: Pump Action
Caliber: 20 Gauge
Action: Pump Action
Capacity: 5+1
Finish: Mossy Oak Obsession
Stock: Mossy Oak Obsession Adjustable Synthetic
Sights: Adjustable Fiber Optic Sights
Barrel Length: 22 Vent Rib
Overall Length: 39.75 Minimum Length of Pull
Features: Sling Swivel Studs