The Smith & Wesson 642 Airweight is a hammerless revolver that reduces weight by way of an aluminum alloy frame. Chambered for the .38 S&W Special +P cartridge, it has a five shot cylinder and barrel liner that are constructed out of stainless steel. Moreover, the 642 is a snag- free hammerless double action only design. The Smith & Wesson 642 Airweight has a sealed internal hammer for effective concealed shooting and reliability. It is outfitted with a 1.875" barrel, weighs in at just under 1-pound, and rated for +P ammunition. The 642 Airweight is finished in a handsome satin stainless. With a fixed rear and front sight, tis revolver is an accurate, reliable and affordable self defense handgun. No internal lock.