JB42184 Smith & Wesson J Frame Model 42 Air Weight Trigger Used .38 Special 500 Models were numbered beginning in

Models were numbered beginning in 1957–58

Ensuring proper cylinder rotation in both single-action and double-action modes

Tooth Paste *

This Listing Includes: Mainspring

JB42184 Smith & Wesson J Frame Model 42 Air Weight Trigger Used .38 Special 500 Models were numbered beginning inJB42184 Smith & Wesson J Frame Model 42 Air Weight Trigger Used . 38 Special Please call or email with any questions! 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