Smith & Wesson K Frame Model 66 Cylinder & Yoke Stainless 6-Shot Non-Recessed Used Part 6678C
$129.99
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Smith & Wesson K Frame Model 66 Cylinder & Yoke Stainless 6-Shot Non-Recessed Used Part 6678C
$129.99
Smith & Wesson K Frame Model 66 Cylinder & Yoke Assembly — Stainless Steel | 6-Shot Non-Recessed | Old Style | Used | Part #6678C
Factory OEM cylinder and yoke assembly for Smith & Wesson K Frame Model 66 Combat Magnum revolvers. Stainless steel construction, 6-shot non-recessed cylinder, old style design compatible with 3-inch and longer barrels. Chambered in .357 Magnum — also fires .38 Special. Genuine S&W factory part in used condition.
This listing is for the cylinder and yoke assembly only. Condition: Used, factory original.
Specifications
- Part Number: 6678C
- Frame: K Frame
- Model: Model 66 Combat Magnum
- Caliber: .357 Magnum (also fires .38 Special)
- Capacity: 6-Shot
- Cylinder Design: Non-Recessed
- Style: Old Style
- Barrel Compatibility: 3-inch and longer barrels only
- Material: Stainless Steel
- Condition: Used / Factory Original OEM
Model Compatibility Chart
| Model | Caliber | Finish | Barrel Length | Notes |
|---|---|---|---|---|
| Model 66 | .357 Magnum / .38 Special | Stainless | 3", 4", 6" | Non-recessed, old style; verify dash number compatibility |
Important: This cylinder is specific to old style K Frame Model 66 revolvers with 3-inch or longer barrels. It is not compatible with 2.5-inch snub-nose variants or newer production Model 66 revolvers (post-2014 Classic reintroduction). Cylinders are caliber-specific and frame-specific — not interchangeable with J, L, or N Frame models. Verify your revolver’s dash number before ordering. See our Model 66 extractor compatibility notes: older style (66, 66-1, 66-2, 66-3) vs. newer style (66-4 and later) extractors are not interchangeable.
Function
The cylinder and yoke assembly is the rotating chamber unit that holds and aligns cartridges with the barrel for firing. The yoke (crane) allows the cylinder to swing out of the frame for loading and unloading. A damaged or out-of-spec cylinder can cause timing failures, cylinder gap issues, and unsafe conditions.
Installation Note
Professional gunsmith installation required. Cylinder replacement involves timing verification, cylinder gap measurement, and endshake adjustment. Do not attempt without proper tools and training.