Polarstar F1 HPA Conversion For M4-M16 w- REV3 FCU H&K -Heavy duty mil

-Heavy duty mil

·          Total of 16 ¾ inches of Rail Space on Scope Housing

Description: CTW/PTW Cylinder Head Assembly

The butt plate is rubberized and textured to provide a solid foundation for the shooter when firing

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Polarstar F1 HPA Conversion For M4-M16 w- REV3 FCU H&K -Heavy duty milWhat is the F1? Like the Fusion Engine and JACK, the patent pending F1 is a high performance HPA (High Pressure Air) system which replaces the traditional piston and gears of an AEG with a programmable pneumatic system. Flow Control The unique flow control system uses an integral check valve to regulate the forward speed of the nozzle while maintaining the fastest retract speed possible. This system is also what makes the F1's "2 stage" firing