The KNS Anti Walk Kit is a trigger pin retainer kit that prevents the trigger pins from walking out while firing. Standard on all POF rifles.
KNS Precision Non-Rotating Trigger / Hammer Pins Gen 2 Mod 2 (.154) - Dance's Sporting Goods
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KNS Precision .154 Non-Rotating Trigger & Hammer Pins: Gen JJ
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AR-15/AR-10 Parts and Accessories - AR-15 Non-Rotating Trigger/Hammer Pin Sets - Page 1 - KNS Precision Inc.
Gen JJ KNS Non-Rotating Trigger Group Pins .154 Inches