The Smith & Wesson Mainspring For S&W 400/910 is a factory replacement coil spring designed to restore proper hammer energy and reliable ignition in a wide range of Smith & Wesson metal-frame pistols. Built to original specifications, this steel mainspring offers consistent tension and dependable performance for shooters who prefer maintaining their pistols with genuine parts.

This mainspring is intended for owners of compatible Smith & Wesson models who want to keep their handgun running smoothly for range use, training, or regular duty-style carry. As a direct replacement part, it helps ensure consistent trigger feel and reliable function without altering the pistol’s characteristics. Backed by Smith & Wesson’s long-standing reputation for quality firearms and components, this mainspring is a practical choice for maintaining your pistol’s performance.

• Manufacturer: Smith & Wesson
• Model: Mainspring For S&W 400/910
• Material: Steel
• Quantity: 1
• Make Model Fit: Smith & Wesson .400, .4006, .4043, .4046, .410, .4506, .4566, .4586, .5903, .5906, .5943, .5946, .910