The most common designation for various “humped back” hammer shrouded Smith and Wesson snubs. The hammer shrouded frame was produced to compete with Colt’s factory produced, after-market hammer shroud attachment. The hammer shrouded design permits a small portion of the hammer spur to protrude and allows the shooter to thumb back the hammer to a single action condition while preventing the hammer spur from catching material during the draw stroke. Models include the Model 38 (aluminum-alloy frame), the Model 49 (blue steel), and the Model 649 (stainless steel)