The 2.125" Model 640 Centennial is the current production stainless fully-enclosed-hammer J-Frame in .357 Magnum. The DAO mechanism and stainless construction make it one of the most reliable and snag-free carry revolvers available. Type: Revolver Action: Double-Action Only Caliber: 357 Magnum Capacity: 5 Year introduced: 1990, USA Weight: 22.4 oz Overall length: 6.5" Status: Active Intended use: Concealed Carry