66185A Smith & Wesson K Frame Model 66 Trigger .310" Used .357 Magnum I Frame 40 S&W only

40 S&W only

265" Wide Trigger — Used

357 Magnum S

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6558 Smith & Wesson K Frame Model 65

66185A Smith & Wesson K Frame Model 66 Trigger .310" Used .357 Magnum I Frame 40 S&W only66185A 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