The S&W Model 10 Military and Police is the best-selling revolver in history and the foundational American police service revolver from 1899 through the 1980s. The heavy barrel 4-inch configuration was the standard patrol configuration for most American police departments for six decades. The K-frame design has been the template for S&W medium-frame revolvers ever since. Type: Revolver Action: Double-Action Caliber: .38 Special Capacity: 6 Year introduced: 1899, USA Weight: 30.5 oz Overall length: 9.5" Status: Active Intended use: law_enforcement, service, collecting