JS192F Smith & Wesson J Frame Model 640 .236" Trigger .38 Special 3914 If you need assistance identifying

If you need assistance identifying your revolver or confirming compatibility

Premium Wolff Power Rib mainspring designed for Smith & Wesson K

Factory Smith & Wesson stainless steel extractor rod for K Frame and L Frame revolvers with 3" or longer barrels

New Style vs

JS192F Smith & Wesson J Frame Model 640 .236" Trigger .38 Special 3914 If you need assistance identifyingJS192F 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