S&W Used K Frame Model 13 Strain Screw Round Butt .357 Magnum 13172A

Smith & Wesson Used K Frame Model 13 Strain Screw — Round Butt

Part Number: 13172A

Genuine OEM Smith & Wesson strain screw pulled from a round butt K Frame Model 13 revolver. Cleaned and inspected — a reliable surplus option for restoring or repairing your Model 13 at a fraction of new part pricing. The strain screw adjusts mainspring tension and is a key component in trigger pull tuning.

Key Features:

• Genuine S&W OEM Part: Factory original component
• Condition: Used / Surplus — cleaned and inspected
• Configuration: Round Butt
• Function: Adjusts mainspring tension; affects trigger pull weight
• Direct Replacement: Fits round butt K Frame Model 13 revolvers

Compatible Models:

• Smith & Wesson K Frame Model 13 Round Butt (.357 Magnum / .38 Special)

Technical Specifications:

• Part Type: Strain Screw
• Frame Size: K Frame
• Configuration: Round Butt
• Caliber: .357 Magnum / .38 Special
• Manufacturer: Smith & Wesson (OEM)
• Condition: Used
• Part Number: 13172A

Installation Note:

Disassembly and reassembly required. Strain screw adjustment affects trigger pull — installation and tuning by a qualified gunsmith is recommended. Always function test after installation to ensure safe and reliable operation.

Package Contents: 1 Used S&W Strain Screw, Round Butt (Part #13172A)