This is a Ruger Rifle: Semi-Auto known as the AR-556 chambered in 450 Bushmaster, model # 8522, UPC 736676085224
Model Series: AR-556
Gun Type: Rifle: Semi-Auto
Caliber: 450 Bushmaster
Action: Semi-Automatic
Capacity: 5+1
Finish: Black
Stock: Black Synthetic Collapsible/ Magpul MOE Grip
Sights: No Sights
Barrel Length: 18.63 1-16RH TWIST
Overall Length: 35.60 - 38.90
Features: 15 Free Float M-LOK Handguard/ Ruger Elite Trigger
