K939A Smith & Wesson K Frame Model 66 Internal Parts .357 Magnum magazine spring 308 Winchester

308 Winchester

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

or handguns

Critical Component: Controls slide cycling and ensures reliable function

Ideal for co-witnessing iron sights with red dot optics

K939A Smith & Wesson K Frame Model 66 Internal Parts .357 Magnum magazine spring 308 WinchesterK939A 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