This is a Mossberg Shotgun: Pump Action known as the 590A1 chambered in 12 Gauge, model # 51773, UPC 015813517737
Model Series: 590A1
Gun Type: Shotgun: Pump Action
Caliber: 12 Gauge
Action: Pump Action
Capacity: 8+1
Finish: Parkerized
Stock: Black Synthetic MAGPUL SGA Stock and MOE Forend
Sights: XS Ghost Ring Sights
Barrel Length: 20 Heavy Wall Barrel
Overall Length: 41
Features: Front & Receiver Sling Plates/ Metal Trigger Guard