Smith & Wesson K Frame Model 19-4 Cylinder Stop & Spring .357 Magnum 1981H

Smith & Wesson K Frame Model 19-4 Cylinder Stop & Spring — Old Style

Part Number: 1981H  |  Condition: Pre-Owned / Used  |  Caliber: .357 Magnum / .38 Special  |  Frame: K Frame

Keep your Model 19-4 Combat Magnum timed and functioning correctly with this genuine Smith & Wesson factory cylinder stop and spring set. The cylinder stop (also called the bolt) is the part that locks the cylinder in alignment with the barrel at the moment of firing — a critical component for accuracy and safe operation.

• Genuine S&W factory parts — same specs, materials, and tolerances as original
• Compatible with S&W K Frame Model 19-4 revolvers chambered in .357 Magnum / .38 Special
• Old-style design — verify compatibility with your specific serial range before ordering
• Includes cylinder stop and cylinder stop spring
• Pre-owned components in serviceable condition
• Professional installation recommended — gunsmith fitting may be required

How to Identify Your S&W Model Number

Swing out the cylinder and check behind the yoke on the frame. Model numbers were introduced in 1957–58. If no model number is present, your revolver may pre-date that era — contact us with your serial number and we'll help you find the right part.

Questions? Email or call USA Guns And Gear — we specialize in new, used, and new-old-stock Smith & Wesson double-action revolver parts.