The 640 Pro Series is a factory-tuned DAO stainless Centennial J-Frame .357 Magnum with a Performance Center-quality action job, chamfered cylinder, and Hi-Viz front sight. It combines the simplicity of the Centennial with competitive trigger quality. Type: Revolver Action: Double-Action Only Caliber: 357 Magnum Capacity: 5 Year introduced: 2007, USA Weight: 22.5 oz Overall length: 6.5" Status: Active Intended use: Concealed Carry / Defensive