Smith & Wesson Model 610 produced without the internal lock mechanism — produced in response to customer demand for a 10mm N-frame revolver without the controversial Hillary Hole internal lock. Type: Revolver Action: DA/SA Revolver Caliber: 10mm Auto Capacity: 6 Year introduced: 2015, United States Weight: 44 oz Overall length: 12" Status: Active Intended use: Hunting, Competition