The Model 340 is an Airweight Scandium-framed J-Frame with a titanium cylinder, chambered in .357 Magnum. Weighing approximately 12 oz, it is one of the most powerful revolvers for its weight — though recoil with full-power .357 Magnum is severe. Type: Revolver Action: Double-Action Only Caliber: 357 Magnum Capacity: 5 Year introduced: 2000, USA Weight: 12 oz Overall length: 6.3" Status: Active Intended use: Concealed Carry