Polarstar F1 HPA Conversion For M4-M16 w- REV3 FCU H&K Description: NcStar Tactical Back Pack(ACU)

Description: NcStar Tactical Back Pack(ACU)

Amazingly Accurate

2008 Year Model P

1 cm [15"] Inner Barrel Length: 370 mm Inner Barrel Diameter: 6

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Polarstar F1 HPA Conversion For M4-M16 w- REV3 FCU H&K Description: NcStar Tactical Back Pack(ACU)What 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