The ultimate backup and concealed carry handgun has arrived, bringing revolvers into the 21st centurty. When you need a lightweight carry revolver, you turn to Smith & Wesson's Small Frame Airweight Series. They are the original aluminum, small frame revolvers chambered in .38 S&W Special +P. The 642 features an enclosed hammer for a snag-free draw, and a serrated ramp front sight for fast target acquisition. This stainless-steel and alloy-framed 5 shot revolver weighs a mere 15 ounces, yet proves to be extremely accurate with a barrel length of less than 2 inches. This model does not have an internal locking system.