The Sig Armorer SuperStrut Mainspring System - P220The Sig Armorer SuperStrut Mainspring System P220 For installation review video click HERE! The Sig Armorer P220 SuperStrut: 4140 Steel EDM Wire Cut Precision Hand Polishing Nickel Boron Nitride Coating Fits Both SAO & DASA Models The P220 SuperStrut Mainspring System fixes: Safety Crossbolt Impact Mainspring Offset (no more bent mainsprings!) Mainspring Fatigue Mainspring Gouging The Sig Armorer P220 SuperStrut Mainspring System includes the
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The Sig Armorer SuperStrut Mainspring System - P220