66185A Smith & Wesson K Frame Model 66 Trigger .310" Used .357 Magnum model 37 Factory-new blue steel cylinder and

Factory-new blue steel cylinder and extractor assembly for Smith & Wesson K Frame Model 48 revolvers

Smith & Wesson Rear Sight Blade -

Fits the standard butt stock trap door compartment on M1A and M14 pattern rifles

Fits Smith & Wesson K

Ensures proper timing and cylinder lockup

66185A Smith & Wesson K Frame Model 66 Trigger .310" Used .357 Magnum model 37 Factory-new blue steel cylinder and66185A 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