Smith & Wesson K Frame Model 19-5 .357 Magnum Strain Screw Round Butt 19172B

Smith & Wesson K Frame Model 19-5 Strain Screw – Round Butt

Restore proper mainspring tension and trigger pull consistency in your Model 19-5 with this genuine Smith & Wesson factory strain screw. The strain screw threads into the grip frame and bears against the mainspring, directly controlling hammer fall force — a small but critical component for reliable ignition in any K Frame .357 Magnum revolver.

• Part Number: 19172B
• Fits: S&W K Frame Model 19-5 – Round Butt configuration
• Caliber: .357 Magnum / .38 Special
• Condition: Pre-owned, inspected component
• Type: Genuine Smith & Wesson factory replacement part

Compatibility Note

This strain screw is designed for the round butt variant of the Model 19-5. To confirm your model number and dash number, swing out the cylinder and check behind the yoke on the frame. The dash number (e.g. –19-5”) indicates the engineering change level and may affect parts compatibility.

Installation

Disassembly and reassembly are required to replace this part. Installation by a qualified gunsmith is recommended. Factory replacement parts are manufactured to the exact same specifications, tolerances, and materials as the originals.

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