The Wilson Combat Custom-Tune Spring Kit (brand part no. 321) is a drop-in trigger tuning kit engineered specifically for Smith & Wesson J-Frame revolvers. Built from high-tensile spring wire, this accessory kit lightens the single-action trigger pull and smooths the double-action stroke without touching the internal geometry of the revolver. It is the same approach Wilson Combat uses across its revolver spring line: reduce spring weight where it counts while keeping the gun reliable for defensive carry. For J-Frame owners looking for a crisper, lighter trigger without a full action job, this kit is a fast, affordable upgrade.

Key Specifications

• Purpose-built as an Accessory-Kit for direct fitment to the S&W J-Frame revolver platform.
• Includes a No. 8 reduced-power hammer spring for a lighter single-action pull.
• Includes a No. 13 reduced-power rebound spring for double-action tuning.
• Includes a No. 14 reduced-power rebound spring for double-action tuning.
• Includes a No. 15 reduced-power rebound spring for double-action tuning.
• Manufactured from high-tensile spring wire for consistent tension and long service life.
• Lightens the single-action trigger pull on J-Frame revolvers.
• Smooths and lightens the double-action trigger pull for a more controllable stroke.
• Marketed under Wilson Combat’s Custom Tune line of drop-in revolver spring kits.

Frequently Asked Questions

Which revolvers does this kit fit? It is designed specifically for Smith & Wesson J-Frame revolvers.

Does it require gunsmithing to install? No special machining is needed; the springs are direct replacements for the factory hammer and rebound springs.

Can I choose how light the trigger pull feels? Yes, the kit includes three different rebound spring weights (No. 13, 14, and 15) so you can dial in double-action feel.

Buy the Wilson Combat Custom-Tune Spring Kit for S&W J-Frame

Give your J-Frame a lighter, more consistent trigger pull without sending it out for a full action job. Order the Custom-Tune Spring Kit from Wilson Combat in our handgun parts lineup, shipped fast from our Lubbock, Texas gun shop.