S&W K Frame Model K38 Pre-Model 15 Thumb Piece & Nut .38 Special – Part# 15180

Smith & Wesson K Frame Model K38 Pre-Model 15 Thumb Piece & Nut – Old Style

Restore smooth cylinder release on your K38 or Pre-Model 15 with this factory-original thumb piece and nut set. The thumb piece (cylinder release latch) is the lever you push forward to swing the cylinder out — a worn, bent, or missing thumb piece makes the cylinder difficult or impossible to open. The nut secures the thumb piece to the frame. This old-style blue steel matched set features the correct 5-screw era design for the K Frame Model K38 (Pre-Model 15) chambered in .38 Special.

• Part Number: 15180
• Fits: Smith & Wesson K Frame Model K38 / Pre-Model 15
• Caliber: .38 Special
• Includes: Thumb Piece (Cylinder Release) & Retaining Nut
• Finish: Blue Steel
• Era: 5-Screw Design (Old Style)
• Condition: Used (factory original)
• Installation: Gunsmith fitting recommended

Factory Replacement Quality

Genuine Smith & Wesson factory parts manufactured to the exact specifications and tolerances of the originals — same dimensions, same thread pitch on the nut, same reliable cylinder release function. No aftermarket substitutes.

About the K38 / Pre-Model 15

The K38 Masterpiece (later designated the Model 15 Combat Masterpiece) is one of the most celebrated K Frame revolvers ever produced. Pre-model revolvers predate the 1957–58 model number system; if your revolver has no model number stamped behind the yoke, contact us with the serial number and we'll confirm compatibility.

Questions? Call or email us — we're happy to help you get the right part the first time.