HPA Conversion Kit F2™ V3 for AK - PolarStar

• Dual Solenoid design of the F2™, winner of the “Best HPA Engine” in the 9th Annual Airsoft Players Choice Awards, provides the same functionality as the legendary Fusion Engine™ but in a more compact, efficient, and flexible design.
• Dual solenoids allow the nozzle and shut off valve to be independently adjusted to achieve unparalleled control of both fill time and air volume used. Additionally, it allows for changing the shooting sequence, enabling it to operate in both close bolt and "AEG" mode.
  The F2™ features a new one-piece, lightweight poppet valve design, yet it still operates on the same principle as the Fusion Engine™. This valve is capable of operating at lower pressures and works with a smaller volume of air, which optimizes air efficiency.
• The robust construction allows for an operating pressure range from 45 psi to 145 psi, enabling the F2™ to achieve muzzle velocities from CQB to DMR, while only using a single nozzle for the entire velocity adjustment range.
• Additionally, its nozzle is pre-tensioned forward, ensuring consistent loading force regardless of operating pressure. It shares the same spring as the Fusion Engine™ with the option of a light and heavy spring for adjusting loading force.

Muzzle velocity: 480fps at 0.20g BB and 145psi

The F2 allows for easy velocity adjustment by changing the input pressure and does not require different nozzles to achieve its full power range. As an example, a standard AK-47 can have its velocity adjusted from 280 fps to approximately 480 fps at 0.20g BB. The speed may vary between models as longer barrels will increase the maximum speed, while shorter barrels will decrease it.

ROF: 30rps

The maximum cyclic rate of the F2 system is influenced by several factors, such as operating pressure and the quality of the magazine and BB used. In most standard configurations, however, it is possible to achieve 30 rounds per second. Which is a decent rate of fire.

Air Utilization: 1,000+ shots from a 13/3000 bottle at 1.5 J with 0.28 g weight

Although this was not a primary requirement during development, the F2™ boasts some very decent performance in this category. This is possible thanks to an intelligently arranged design that minimizes empty air volume, resulting in better range, faster response, and less air consumed per shot.

(tested with a 6.05mm barrel, 375mm in length)