Smith & Wesson K Frame Thumb Piece & Nut Blue Steel Old Style - 10179E 2nd Generation The Model 39 is a

The Model 39 is a first-generation pistol with a simple two-digit model number

The rebound slide assembly controls the trigger's return to its forward position after each shot and manages the interaction between the trigger and hammer

The rebound slide returns the trigger to its forward position after firing

Barrel Length: 4" (full-size)

Smith & Wesson K Frame Thumb Piece & Nut Blue Steel Old Style - 10179E 2nd Generation The Model 39 is aSmith & Wesson K Frame Thumb Piece & Nut Blue Steel, Old Style This factory original Smith & Wesson K Frame Thumb Piece & Nut Assembly is the external cylinder release lever and its retaining nut. The thumb piece is pressed 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. A worn, bent, or broken thumb piece makes