The Smith & Wesson Model 640 is a robust small-frame revolver that epitomizes the fusion of classic design with contemporary enhancements, ideal for concealed carry. Introduced in 1989, this model is part of Smith & Wesson's revered Centennial line and features a full stainless steel construction including the frame, barrel, and cylinder, ensuring durability and resistance to corrosion. The Model 640 is designed without an external hammer, allowing for a snag-free draw, which is critical in high-stress defensive situations. Rated for continuous use with +P ammunition, this revolver provides formidable stopping power in a compact package, accommodating both .38 Special and .357 Magnum calibers, making it versatile for various self-defense scenarios. The Smith & Wesson 640 Pro Series is a robust, all-stainless steel, double-action only revolver. It features a compact J-Frame design, holds 5 rounds, and is chambered in .357 Magnum. Further advancing its utility, the Model 640 supports a black blade front sight and a fixed rear sight for reliable accuracy despite its snub-nosed design. The swing-out cylinder typical of J-frame revolvers enhances ease of reloading under pressure. Over the years, the Model 640 has seen iterations in barrel lengths and materials to suit different user preferences, including a lighter, Scandium-framed version introduced in 2001, weighing just 10.9 oz. This continual evolution reflects Smith & Wesson's commitment to providing high-performance, reliable self-defense firearms that meet the needs of both law enforcement and private citizens. The Model 640 remains a preferred choice for those seeking a powerful, reliable revolver in a discreet and easy-to-carry form.