This is a Mossberg Shotgun: Pump Action known as the 505 chambered in 20 Gauge, model # 57110, UPC 015813571104
Model Series: 505
Gun Type: Shotgun: Pump Action
Caliber: 20 Gauge
Action: Pump Action
Capacity: 4+1
Finish: Blue
Stock: Hardwood/ Checkered/ Pistol Grip
Sights: Twin Bead
Barrel Length: 20 Vent Rib
Overall Length: 37.5
Features: Length of Pull 12