JS139 Smith & Wesson J Frame Model 640 Internal Parts Used .38 Special j32n Works on new and improved

Works on new and improved spring indent system

Perfect for patriots who believe in the right to self-defense

160" White Outline

or as backup components for your revolver

JS139 Smith & Wesson J Frame Model 640 Internal Parts Used .38 Special j32n Works on new and improvedJS139 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