JS192F Smith & Wesson J Frame Model 640 .236" Trigger .38 Special Model K22 Style: Grooved

Style: Grooved

ensuring proper timing and reliable operation

Featuring a blue finish and designed specifically for 2-inch barrels

skipped chambers

Finish: Nickel

JS192F Smith & Wesson J Frame Model 640 .236" Trigger .38 Special Model K22 Style: GroovedJS192F Smith & Wesson J Frame Model 640 . 236" Trigger . 38 Special 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 still find the part you need with the serial # . If this is the case contact us and we will need a