This is a Ruger Revolver: Double Action known as the GP100 chambered in 10MM, model # 1775-RUG, UPC 736676017751
Model Series: GP100
Gun Type: Revolver: Double Action
Caliber: 10MM
Action: Double Action
Capacity: 6
Finish: Satin Stainless
Stock: Custom Hogue Stippled Hardwood Grips
Sights: Front: Fiber Optic Rear: Adjustable
Barrel Length: 4.2
Overall Length: 9.5
Features: Half-Lug Barrel