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PolarStar F2 M4 Conversion Kit | V2 HPA Unit | HPA Drop in Kit
This specific F2 is designed with the M4/M16 and typical Version 2 Gearboxes in mind. What is F2? F2 is essentially a Mini Fusion Engine. It offers the same adjust-ability and performance as the Fusion Engine in a cylinder sized package. Patented Dual Solenoid Design The dual sole...
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