Smith & Wesson K Frame Model 66 Cylinder & Yoke Assembly .357 Magnum Stainless - 6678H Internal Components The yoke length and ejector

The yoke length and ejector rod are matched to these barrel lengths

You should see "637" or a dash variant like "637-1"

Smith & Wesson OEM Rear Night Sight with Tritium for M&P 9/40 Pistols

Part Number: 13171

Smith & Wesson K Frame Model 66 Cylinder & Yoke Assembly .357 Magnum Stainless - 6678H Internal Components The yoke length and ejectorSmith & Wesson K Frame Model 66 Cylinder & Yoke Assembly . 357 Magnum, Stainless This factory original Smith & Wesson K Frame Cylinder & Yoke Assembly is a complete stainless steel 6 shot cylinder and yoke unit for the Model 66 Combat Magnum revolver. The non recessed cylinder design is correct for old style Model 66 revolvers. The yoke aligns the cylinder with the frame and barrel, while the cylinder houses the six chambers together they are one of