The Model 642 Centennial Airweight is S&W's best-selling revolver — a DAO aluminum-framed J-Frame with stainless cylinder and fully enclosed hammer. Its combination of light weight, snag-free design, and +P capability makes it the definitive pocket carry revolver. Type: Revolver Action: Double-Action Only Caliber: 38 Special +P Capacity: 5 Year introduced: 1990, USA Weight: 15 oz Overall length: 6.3" Status: Active Intended use: Concealed Carry