K155 Smith & Wesson Used K Frame Model 1905 M&P 2" .38 Special Barrel Pin OEM Part The mainspring controls hammer tension

The mainspring controls hammer tension and directly affects trigger pull weight and smoothness

Note: If your revolver was manufactured before 1957-58

12 thru 386PD

Performance Center versions of S&W revolvers feature hand-selected parts and precision tuning

K155 Smith & Wesson Used K Frame Model 1905 M&P 2" .38 Special Barrel Pin OEM Part The mainspring controls hammer tensionK155 Smith & Wesson Used K Frame Model 1905 M&P 2" . 38 Special Barrel Pin 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