Smith & Wesson K Frame Model 66-1 Bolt Spring & Plunger .357 Magnum Stainless Steel Old Style Used 6645

K Frame Model 66-1 Bolt Spring & Plunger - Factory OEM Part

This genuine Smith & Wesson bolt spring and plunger assembly is designed specifically for K Frame Model 66-1 revolvers chambered in .357 Magnum. Manufactured in stainless steel with the old-style configuration, this used factory part ensures reliable cylinder lockup and timing.

Key Features 

• Frame: K Frame
• Model: 66-1 (old style)
• Caliber: .357 Magnum (centerfire)
• Material: Stainless steel
• Condition: Used, functional OEM part
• Part Number: 6645

Compatibility

This bolt spring and plunger fits Smith & Wesson K Frame Model 66-1 revolvers. K Frame internal parts are generally interchangeable across centerfire models (10, 11, 12, 13, 14, 15, 16, 19, 53, 64, 65, 66, 67), with the exception of hammers which are caliber-specific.

Why Choose This Part

When your revolver's cylinder lockup feels loose or timing is off, the bolt spring and plunger are often the culprits. This factory Smith & Wesson component restores proper cylinder alignment and ensures your revolver locks up tight with every trigger pull—critical for accuracy and safety.