The Sig Armorer SuperStrut:

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

The SuperStrut Mainspring System fixes:

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

This SuperStrut fits the following Sig Pistol Models:

• P6 (with slight stock grip inside relief)
• P225 (with slight stock grip inside relief)
• P226
• P227
• P228 (with slight stock grip inside relief)
• P229
• P239 (with slight stock grip inside relief)

The Sig Armorer 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.

Not for use in DAK pistols.