Smith & Wesson Model 657-4 Mountain Gun .41 Rem. Mag., 4-inch Stainless DA/SA N-Frame Revolver - Original Factory Case Included
This Smith & Wesson Model 657-4 Mountain Gun is a stainless-steel N-frame revolver chambered in .41 Rem. Mag., configured with the hallmark tapered 4-inch barrel, partial underlug, and serrated top rib. It is a pre-lock example marked 657-4 on the yoke cut, with "Mountain Gun" script on the barrel and product code 103949 denoting this specific configuration. Features include a six-shot fluted cylinder, adjustable sights, and S&W finger-groove rubber monogrips, making this a distinctive 1990s-era variant.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: There are finishing scuffs visible on the frame.
What's Included
- Smith & Wesson factory blue plastic hard case with molded S&W logo and end label for Model 657-4 (Product Code 103949)
- Smith & Wesson Revolvers Safety, Instruction & Parts Manual
Built on the stainless-steel N-frame, this six-shot Model 657-4 Mountain Gun pairs .41 Rem. Mag. chambering with a fluted cylinder and a brushed/satin stainless finish. The barrel is a tapered 4-inch design with a partial underlug and serrated top rib, and it carries the "Mountain Gun" script specific to this series.
Controls and sights are set up for practical use: double-action/single-action operation, a smooth-faced trigger, an exposed hammer with a checkered spur, and a checkered cylinder latch. Sight regulation comes from adjustable iron sights, with a black, pinned, serrated-ramp front and an adjustable rear.
The frame is the pre-lock style (no internal key lock) and is marked 657-4 on the yoke cut to indicate the engineering change. Factory markings include "MADE IN U.S.A. / MARCAS REGISTRADAS / SMITH & WESSON / SPRINGFIELD, MASS." The revolver wears S&W black rubber finger-groove monogrips with S&W medallions.
Product code 103949 identifies the Mountain Gun configuration for the 657-4. This 1990s-era United States-made revolver combines stainless construction, adjustable sights, and the distinct Mountain Gun barrel profile in the .41 Rem. Mag. chambering.