Smith & Wesson K Frame Model 19 .357 Magnum Strain Screw Round Butt 19172A

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

Keep your Model 19's trigger pull consistent and reliable with this genuine Smith & Wesson factory strain screw. The strain screw controls mainspring tension, directly affecting hammer fall force and trigger feel — a critical component for proper function in any K Frame .357 Magnum revolver.

• Part Number: 19172A
• Fits: S&W K Frame Model 19 – 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. To confirm your model number, swing out the cylinder and check behind the yoke on the frame. Model numbers were introduced in 1957–58; if no number is present, contact us with your serial number for assistance.

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.

Questions? Shoot us an email or give us a call — we're here for all your S&W needs. – USA Guns And Gear