S&W Multi-Model Auto Pistol Mainspring New, Part 103620000

Smith & Wesson Multi-Model Auto Pistol Mainspring — New

Part #103620000 | New OEM Factory Part | Multiple Calibers

• Condition: New — original Smith & Wesson factory part
• Type: Mainspring (Hammer Spring)
• Fits: Multiple S&W 1st, 2nd, and 3rd Generation Semi-Automatic Pistols

Compatible Models: 39, 439, 539, 1006, 1026, 1076, 1086, 3904, 3906, 3944, 3946, 4003TSW, 4006TSW, 4043TSW, 4046TSW, 4553TSW, 4563TSW, 4566TSW, 4583TSW, 4586TSW, 5903TSW, 5906TSW, 5943TSW

The mainspring (hammer spring) powers the hammer to strike the firing pin for reliable ignition in both double-action and single-action modes. A worn or weakened mainspring can cause light primer strikes and misfires. This new OEM mainspring restores factory-correct trigger function and ignition reliability.

Installation Note: Disassembly of the frame required. Installation by a qualified gunsmith is recommended.

We specialize in new, used, and new-old-stock Smith & Wesson semi-automatic pistol parts. Contact us for any S&W parts needs.