66185A Smith & Wesson K Frame Model 66 Trigger .310" Used .357 Magnum Barrel Sleeve Compatible Models: SD40

Compatible Models: SD40

Genuine factory new Smith & Wesson firing pin bushing for K Frame

Genuine factory new Smith & Wesson cylinder assembly designed for the J Frame Model 317 AirLite revolver

This spring pack fits Smith & Wesson J-Frame revolvers

66185A Smith & Wesson K Frame Model 66 Trigger .310" Used .357 Magnum Barrel Sleeve Compatible Models: SD4066185A 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