66185A Smith & Wesson K Frame Model 66 Trigger .310" Used .357 Magnum model 37 357 Sig Compact models

357 Sig Compact models

300"                Stainless Steel (Not for MIM)

Slide only - no internal parts included

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

Part #3345U2

66185A Smith & Wesson K Frame Model 66 Trigger .310" Used .357 Magnum model 37 357 Sig Compact models66185A 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