JB301E Smith & Wesson J Frame Pre Model 30 Thumbpiece & Screw Used .38 Special M1A This precision OEM component ensures

This precision OEM component ensures proper cylinder lockup and timing for reliable revolver function

15 LB Rebound: Lightest reduction

Model 640 Magnum -

Smith & Wesson Model 629 (all variants)

Length: 6 inches

JB301E Smith & Wesson J Frame Pre Model 30 Thumbpiece & Screw Used .38 Special M1A This precision OEM component ensuresJB301E Smith & Wesson J Frame Pre Model 30 Trigger Used . 38 Special 5 Screw 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