66185A Smith & Wesson K Frame Model 66 Trigger .310" Used .357 Magnum model 37 same frame Model 13

same frame Model 13

Ensures proper timing and cylinder lockup

Fits Smith & Wesson K

Disassembly and reassembly by a qualified gunsmith is required

66185A Smith & Wesson K Frame Model 66 Trigger .310" Used .357 Magnum model 37 same frame Model 1366185A Smith & Wesson K Frame Model 66 Trigger . 310" Used Part . 357 Magnum (MIM) New Style 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