The Ruger GP100 is the definitive modern service revolver, designed from the ground up to handle sustained .357 Magnum fire without the forcing cone issues experienced in competitive K-frame designs. Introduced in 1985 to replace the Security-Six, the GP100 features a triple-locking cylinder, full-length crane, and a solid steel frame with no side plate. The 4.2-inch barrel is the standard duty and defensive configuration. 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, hunting