N-frame revolver chambered in 10mm Auto (and .40 S&W with moon clips). The Model 610 is the primary production 10mm revolver in S&W's history. 4-inch barrel standard. Moon clips required for both 10mm and .40 S&W headspacing. Available in both 4- and 6.5-inch barrel lengths. Type: Revolver Action: Double-Action / Single-Action Caliber: 10mm Capacity: 6 Year introduced: 1990, USA Weight: 44.5 oz Overall length: 9.5" Status: Active Intended use: Hunting, Competitive Shooting