This is a Mossberg Shotgun: Pump Action known as the 500 chambered in 20 Gauge, model # 54047, UPC 015813540476
Model Series: 500
Gun Type: Shotgun: Pump Action
Caliber: 20 Gauge
Action: Pump Action
Capacity: 2.75 5+1
Finish: Blue
Stock: Synthetic/ Checkered/ Dual Comb
Sights: 26 Twin Bead/ 24 with 2.5x20 Scope
Barrel Length: 24 and 26 Vent Rib
Overall Length: 45.5