Smith & Wesson K Frame Model 66-4 Barrel Pinned Stainless Steel Used 2 1/2" .357 Magnum 6623B Airweight Function: The trigger controls the 1572 Color:LIGHT WOOD This is a complete .500 inch trigger

Function: The trigger controls the hammer release in both single-action (hammer cocked manually) and double-action (trigger pull cocks and releases hammer) operation

Part Number: 12179

Solves These Common Issues

Sight Height:

Early production revolvers like Serial# 3312 predate the model number system by decades — if you're unsure whether this part fits your specific revolver

Smith & Wesson K Frame Model 66 4 Barrel Pinned Stainless Steel Used 2 1 2" .357 Magnum 6623B Airweight Function: The trigger controls the 1572 Color:LIGHT WOOD This is a complete .500 inch trigger Function: The trigger controls the hammer release in both single action (hammer cocked manually) and double action (trigger pull cocks and releases hammer) operation Part Number: 12179