The stainless steel GP100 in the standard 4.2-inch configuration is the most common GP100 variant. Ruger's stainless finish is standard on the GP100 line, offering excellent corrosion resistance and lower maintenance requirements than blued alternatives. The definitive modern service revolver in production finish. Type: Revolver Action: Double-Action Caliber: .357 Magnum Capacity: 6 Year introduced: 1985, USA Weight: 40 oz Overall length: 9.5" Status: Active Intended use: duty, law_enforcement, competition