The Wilson Combat 178 Custom Tune Spring Kit is designed for Smith & Wesson K, L, and N frame revolvers. The kit includes a reduced-power hammer spring and three reduced-power rebound trigger springs for single- or double-action revolvers. It is not intended for rimfire models.

Key Specifications

• The kit fits Smith & Wesson K, L, and N frame revolvers.
• The kit includes one reduced-power hammer spring.
• The rebound trigger springs are rated at 12, 13, and 14 pounds.
• The listed material is steel and alloy.
• The finish or color is listed as blued.
• The listed product dimensions are 0.45 × 3.25 × 6.75 inches.
• The model is identified as Custom Tune.
• The product type is accessory kit.
• The source data states no direct shipment to California.
• The kit is not for rimfire models.

With multiple rebound spring weights included, this kit provides a practical way to select the specified spring option for a compatible centerfire revolver. Its focused component set and clearly identified frame compatibility make it a straightforward addition to a revolver maintenance or customization setup.