A small J-frame revolver that packs a full-sized punch the Smith Wesson Model 640 is a variation of the Model 40 Centennial. Double action only the frame barrel and cylinder are all constructed of stainless steel and the textured grip is synthetic. Chambered in 357 Mag and 38 Special P with a 5-round capacity the snag-free design with an enclosed hammer make the Model 640 a popular choice for concealed carry. DetailsAction DAO - Caliber .357 Magnum .38 SW Special P - Capacity 5 - Finish Stainless - Material Aluminum Alloy Steel - Grips Black Synthetic - Sights Dovetail Tritium Night Sight - Barrel Length 2.125 - Overall Length 6.625 - Weight 22.4 oz - Dovetail Night Sights - Cylinder Cut for Moon Clips - Completing the line between main production and the Performance Center the Smith Wesson Pro Series represents the next step from standard models. These firearms are offered with a variety of enhancements yet still remain true to stock. Bringing competition specifications and features to factory models the Pro Series offer that ready-to-go package while still maintaining production line integrity.