Introduced in 1955 as Airweight Bodyguard. This was a departure from S&W's usual procedure in that the alloy-framed version came first. Chambered for .38 Special and available with 2-in. barrel standard. Although a 3-in. barrel was offered, it is rarely encountered. Frame of Bodyguard is extended to conceal and shroud the hammer, but at the same time allows hammer to be cocked by the thumb. This makes this model an ideal pocket revolver, as it can be drawn without catching on clothing. Available blue or nickel-plated, with checkered walnut grips. Note: All 1998 and later production models were rated for +P ammunition. Three engineering changes.