The Wilson Combat Custom-Tune Spring Kit (Wilson Combat part no. 178) is a drop-in trigger upgrade built for Smith & Wesson K, L, and N frame revolvers. The kit replaces the factory hammer spring with a reduced-power version and includes three interchangeable rebound/trigger springs rated at 12, 13, and 14 pounds, so a shooter can tune trigger pull weight to their own preference rather than being locked into one factory setting. It works on both single-action and double-action revolvers, smoothing the trigger without any machining or fitting of parts. This is the same kind of spring swap competitive revolver shooters and concealed carriers use to get a lighter, more consistent trigger without sending the gun out for gunsmithing.

Key Specifications

• Fits Smith & Wesson K, L, and N frame revolvers.
• Includes a reduced-power hammer spring to lighten trigger pull.
• Includes three rebound/trigger springs at 12, 13, and 14 pounds for tunable weight.
• Lets a shooter dial in trigger feel by selecting the spring weight that suits their hand.
• Works on both single-action and double-action trigger pulls.
• Installs as a complete drop-in kit, with no additional parts to source.
• Ships light at about 0.05 lb, a compact parts kit rather than a full assembly.
• Sold under Wilson Combat’s Custom-Tune line, built specifically for factory trigger jobs rather than a generic universal spring set.

Frequently Asked Questions

Will this kit fit my J-frame S&W revolver? No, this kit is built specifically for K, L, and N frame revolvers, not the smaller J-frame.

Do I need a gunsmith to install it? Most shooters familiar with revolver disassembly can swap the springs themselves, though a gunsmith can install it if preferred.

Can I pick just one trigger pull weight? Yes, the kit includes three spring weights (12, 13, and 14 pounds) so you can select and install the one that feels best.

Buy the Wilson Combat Custom-Tune Spring Kit

Lighten and smooth your revolver’s trigger with this kit from Wilson Combat in our handgun parts selection. Order it from our Lubbock, Texas gun shop for fast, direct shipping right to your door.