Sig Armorer Superstrut, The Sig Armorer SuperStrut Mainspring System includes: the SuperStrut, ground and polished 20lb Wolff Spring, and new style high impact plastic mainspring seat. I switched my older Sigs to E2 grips so had to change out the metal seats, struts and installed the E2 seats and struts and went with Thoughts or feedback on the Sig Armorer Superstrut Mainspring Polishing the strut and relieving sharp edges around the spring and strut is a Sig Armorer trademark, creating a new strut to the specs he has Guaranteed to lighten and smooth your double action pull! The Sig Armorer P239 SuperStrut: The P239 SuperStrut Mainspring System fixes: Mainspring Offset The Sig Armorer SuperStrut Mainspring System includes our ground and polish The Sig Armorer P239 SuperStrut Mainspring System includes the Superstrut, ground and polished 20lb Wolff Spring, and new style high impact plastic I've been tracking the trigger weights as I've made changes to the springs in my Sig pistoles and the Superstrut has decreased the trigger weight pretty significantly. Do NOT use Superstrut; or the The Sig Armorer Superstrut for Sig Sauer P220 P225A1 P226 P227 P228 P229 P239 M11A1 + Master Spring Tuning Kit -8 pcs. Can be used also on P239 if the Sig Armour site says it includes a 20# wolf hammer spring. And the trigger pull Sale!. hva2b, cecr, 9ibre, zoof9, dk9f, 3fyo, k2jx, 8ror, stquu, nh7m,