The Smith & Wesson Model 640 (ATF model 640-3, MFG# 163690) is a small-frame J-Frame revolver built in stainless steel. Designed with an enclosed (internal) hammer and double-action-only operation, it accommodates full-power .357 Magnum cartridges while also accepting .38 Special variants. The compact satin stainless finish, fixed sights and black synthetic grip make it a practical choice for everyday carry and close-range defensive use.
Key Specifications
- The caliber is listed as .357 Magnum and is also described as compatible with .38 Special in product materials.
- The barrel length is 2.13 inches as indicated in multiple product entries.
- The capacity is 5 rounds in a swing-out cylinder.
- The action is Double Action Only (DAO).
- The frame and cylinder feature a satin stainless finish.
- The grips are described as a black synthetic (rubber-style) material.
- The hammer design is an enclosed (internal) hammer for snag resistance.
- Sights are a black blade front with a fixed rear sight.
- The unloaded weight is listed as 23 oz.
- Additional security feature: internal lock.
The Model 640 balances compact dimensions with proven stainless-steel construction and serviceable sights, making it suitable for daily carry or close-range protection where reliability and simplicity are priorities. Its small J-frame footprint and enclosed hammer reduce snagging in a pocket or holster while the DAO trigger and stainless finish keep operation straightforward and corrosion-resistant.
Product information is supplied by the manufacturer and/or distributor and may be automatically formatted or enhanced using AI for clarity and consistency. While we strive for accuracy, specifications, features, and included items may change without notice. Always verify details using the manufacturer’s official documentation and the information shown on this product page before purchase or use.
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