K939A Smith & Wesson K Frame Model 66 Internal Parts .357 Magnum magazine spring Critical Component: Controls slide cycling

Critical Component: Controls slide cycling and ensures reliable function

Critical component for maintaining precise elevation adjustments on your adjustable rear sight

It is not compatible with older Model 66 revolvers that have hollow extractor rods

Western-themed restaurants and bars

Ideal for co-witnessing iron sights with red dot optics

K939A Smith & Wesson K Frame Model 66 Internal Parts .357 Magnum magazine spring Critical Component: Controls slide cyclingK939A Smith & Wesson K Frame Model 66 Internal Parts . 357 Magnum Please call or email with any questions! We sell Smith & Wesson pistol and revolver used, new & new old stock refurbished & new parts. Shoot us an email or give us a call for all your S&W Gun needs USA Guns And Gear 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