The Sig Armorer P239 SuperStrut Mainspring SystemThe Sig Armorer P239 SuperStrut Mainspring System For installation review video click HERE! You can now add our SuperStrut to your Sig Sauer P239 pistol. Guaranteed to lighten and smooth your double action pull! The Sig Armorer P239 SuperStrut: 4140 Steel EDM Wire Cut Precision Hand Polishing Nickel Boron Nitride Coating The P239 SuperStrut Mainspring System fixes: Mainspring Offset (no more bent mainsprings!) Mainspring Fatigue Mainspring Gouging
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