Smith & Wesson K Frame Model 10 Thumb Piece & Nut Blue Steel Old Style Used Part 10179D Internal Parts Function: The firing pin safety

Function: The firing pin safety lever is a passive safety mechanism that prevents the firing pin from moving forward unless the trigger is fully depressed

09" rear adjustable sight for N Frame Model 27 revolvers chambered in

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Smith & Wesson K Frame Model 10 Thumb Piece & Nut Blue Steel Old Style Used Part 10179D Internal Parts Function: The firing pin safetySmith & Wesson K Frame Model 10 Thumb Piece & Nut Blue Steel Old Style Used Part #10179D Factory OEM thumb piece and nut assembly for Smith & Wesson K Frame Model 10 revolvers, old style design in blue steel finish. The thumb piece is the external lever you press to release the cylinder latch, allowing the cylinder to swing out for loading, unloading, and cleaning. The nut secures the thumb piece to the cylinder latch mechanism inside the frame.