Smith & Wesson K Frame Model 15-3 Strain Screw Square Butt Old Style Used .38 Special, Part 15173A

Smith & Wesson K Frame Model 15-3 Strain Screw — Square Butt, Old Style, Used OEM Part

This is a used factory-original strain screw for the Smith & Wesson K Frame Model 15-3 Combat Masterpiece chambered in .38 Special, square butt configuration. The strain screw adjusts mainspring tension and directly affects trigger pull weight — a worn or incorrect strain screw can cause light primer strikes or an overly heavy trigger. This is the old style variant for the square butt frame.

Part Details

• Part Number: 15173A
• Condition: Used / Surplus
• Style: Old Style
• Frame Configuration: Square Butt
• Fits: S&W K Frame Model 15-3 Combat Masterpiece (.38 Special)
• Frame Size: K Frame
• OEM Factory Part

Compatibility Note

This strain screw is specifically for the square butt Model 15-3. Square butt and round butt strain screws are not interchangeable — verify your frame configuration before ordering. Also confirm your dash number, as strain screw fitment can vary across Model 15 variants.

Installation

Installation and fitting by a qualified gunsmith is recommended. Incorrect strain screw tension can affect reliability — do not over-tighten.

Questions? Call or email us — we specialize in S&W OEM parts for revolvers and pistols, new, used, and new-old-stock.