In 1995 Smith & Wesson introduced the Model 640 the first J frame revolver chambered in the powerful .357 Magnum round. The Model 640 is a small frame concealed hammer revolver that packs a full-sized punch. The Model 640 integrates the time-tested features of the original with modern advancements and competition specifications and features. – Model Performance Center® Model 640 Black Edition – CALIBER 357 MAGNUM/38 Special +P – BARREL LENGTH 2.125 – Weight 23 oz. (652 g) – Rear Sight Tritium Night sight – Grip Synthetic grip – Front Sight Tritium Night sight – Capacity 5-rounds – Overall Width 1.7 (4.3 cm) – Barrel 2.125 (5.4 cm) Stainless steel w/Black E-100 Cerakote® finish – Overall Height 4.3 (10.9 cm) – Frame Size Small J-Frame – Cylinder Stainless steel w/Black PVD coating – Overall Length 6.625 (16.8 cm) – Action Double-action only – Frame Stainless steel w/Black E-100 Cerakote® finish – Sight Radius 3.5 (8.9 cm) – Rifling 1:18.75 RH Twist