Smith & Wesson K Frame Model 19-4 Hammer Block .357 Magnum Used - 19120H

OEM Hammer Block for S&W K Frame Model 19-4 Combat Magnum

Keep your Model 19-4 running safely with this authentic Smith & Wesson hammer block (firing pin block). This small but critical safety component sits between the hammer and frame, physically preventing the firing pin from moving forward unless the trigger is fully depressed — a key safeguard against accidental discharge from drops or impacts.

Part Details

• Part Number: 19120H
• Frame: K Frame
• Model: Model 19-4 Combat Magnum
• Caliber: .357 Magnum / .38 Special
• Function: Firing pin block / drop safety
• Condition: Used, inspected, functional

Fitment & Installation

This part is designed for the Smith & Wesson K Frame Model 19-4. Professional gunsmith installation is recommended to ensure proper fit, timing, and function. Always verify compatibility with your specific serial number range before installation.

Genuine OEM S&W replacement part — not aftermarket.