S&W K Frame Model 10 Thumb Piece & Nut Blue Steel .38 Special, Part 10179B Model 4043 Smith & Wesson Model 640-3

Smith & Wesson Model 640-3 — J Frame Centennial

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Case hardened finish for wear resistance

tolerances

No Recoil Spring or guide rod

S&W K Frame Model 10 Thumb Piece & Nut Blue Steel .38 Special, Part 10179B Model 4043 Smith & Wesson Model 640-3Smith & Wesson K Frame Model 10 Thumb Piece & Nut Blue Steel Part #10179B Used OEM Factory Part . 38 Special Fits: S&W K Frame Model 10 Finish: Blue Steel Caliber: . 38 Special Condition: Used original Smith & Wesson factory part, old style Frame Size: K Frame Includes: Thumb Piece and Nut The thumb piece (cylinder release latch) and nut are essential for proper cylinder swing out function. A worn or damaged thumb piece can cause the cylinder to fail