The Sig Armorer P239 SuperStrut Mainspring System

You can now add our Superstrut to your Sig Sauer P239 pistol.

Guaranteed to lighten and smooth your double action pull!

The Sig Armorer SuperStrut:

• 4140 Steel
• EDM Wire Cut
• Precision Hand Polishing
• Nickel Boron Nitride Coating

The SuperStrut Mainspring System fixes:

• Mainspring Offset (no more bent mainsprings!)
• Mainspring Fatigue
• Mainspring Gouging

This SuperStrut fits the following Sig Pistol Models:

• P239

The Sig Armorer P239 SuperStrut Mainspring System includes the Superstrut, ground and polished 20lb Wolff Spring, and new style high impact plastic mainspring seat. Do NOT use Superstrut; or the factory E2 Strut for that matter, with an aluminum or any other metal mainspring seat. The seat is designed to be made from plastic as it works as a bearing against the strut. Metal seats WILL be gouged by the strut and over time will create enough friction to reduce mainspring force and make the double-action pull both gritty and heavy.