S&W K Frame Model 15 Combat Masterpiece Strain Screw Square Butt .38 Special Used, Part# 15173B

Smith & Wesson K Frame Model 15 Combat Masterpiece — Strain Screw, Square Butt, .38 Special

Part# 15173B | Used OEM Factory Part | K Frame

Replace the mainspring strain screw on your Model 15 Combat Masterpiece with this genuine Smith & Wesson factory part. The strain screw controls mainspring tension, directly affecting trigger pull weight — a small part with a big impact on your revolver’s feel and reliability.

• Part: Strain Screw
• Grip Frame: Square Butt
• Caliber: .38 Special
• Frame Size: K Frame
• Compatible Models: Model 15 Combat Masterpiece
• Condition: Used — genuine OEM factory part
• Installation: Gunsmith fitting recommended

Finding Your Model Number

Swing out the cylinder and check behind the yoke on the frame. Model numbers were introduced in 1957–58. If your revolver has no model number, it may pre-date 1957 — contact us with your serial number and we can help identify the correct part.

Factory replacement parts are manufactured to the exact same specifications, tolerances, and materials as the originals.