JS139 Smith & Wesson J Frame Model 640 Internal Parts Used .38 Special 7.62mm Law enforcement officers

Law enforcement officers

22 Magnum Revolver

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For older revolvers without model numbers

JS139 Smith & Wesson J Frame Model 640 Internal Parts Used .38 Special 7.62mm Law enforcement officersJS139 Smith & Wesson J Frame Model 640 Internal Parts Used . 38 Special This Listing Includes: Mainspring, Bolt, Rebound Slide & Spring, 1 Pin, Cylinder Stop and Bushing. How to determine the model number of your Smith & Wesson Revolver. Swing out the cylinder , check behind the yoke on the frame for a MODEL NUMBER. Model numbers began in 1957 58. So if there is no model number then your revolver may be older than 1957 58. In this case we can possibly