The 4-inch Model 66 Combat Magnum Stainless is the duty-length stainless K-frame .357 Magnum, among the most widely used service revolvers in American law enforcement history. It combined the precision adjustable sights of the Masterpiece line with .357 Magnum power and stainless corrosion resistance, becoming the definitive service revolver of the 1970s and 1980s. Type: Revolver Action: Double-Action Caliber: .357 Magnum Capacity: 6 Year introduced: 1970, USA Weight: 36 oz Overall length: 9.25" Status: Active Intended use: duty, law_enforcement, service