Polarstar F2 HPA Engine for Airsoft Rifles (Model: VFC HK417)

  Features Extremely lightweight and compact design Dual solenoid design allows for open and closed bolt firing F2 FCU with LCD allows for easy tuning Spring loaded nozzle provides consistent loading force Lightweight one piece poppet valve can operate at lower pressures Easily adjustable FPS can be used for both CQB and field use without having to change nozzles F2 is essentially a Mini Fusion Engine. It offers the same adjustability and performance as the Fusion Engine in a cylinder sized package.Patented Dual Solenoid Design:The dual solenoid design of the F2 provides the same functionality as the legendary Fusion Engine but in a more compact, efficient and flexible design. Dual solenoids allow for the nozzle and the poppet valve to be adjusted independently of each other for unparalleled control over both the loading time and air volume used. Additionally, this makes it possible to change the firing sequence giving it the ability to operate in both true closed bolt as well as "AEG" mode.Increased Efficiency: The F2 incorporates a new one-piece, lightweight poppet valve design yet still operates on the same principle as the Fusion Engine poppet. This valve is able to operate at lower pressures and uses less air volume to function which optimizes air efficiency.Spring Loaded Nozzle:The F2 nozzle is spring biased forward which provides a consistent loading force regardless of operating pressure. It shares the same spring as the Fusion Engine with both light and heavy spring options available to adjust the loading force.Offset Nozzles: F2 is compatible with virtually every AEG gearbox, including those with offset nozzles by using either a centerline or offset front cylinder. The front cylinders are interchangable and a centerline F2 may be converted to an offset F2 by simply swapping the front cylinder and nozzle.The robust design of the F2 allows for an operating pressure range of 45psi to 145psi which enables it to achieve velocities from CQB to DMR while employing only one nozzle for the entire velocity adjustment range. Manufacturer: PolarStar Airsoft Specifications: Operating Pressure 45 - 145psiVelocity Ranges: 205fps - 500fpsLength: 4"Compatibility: VFC HK417Material: Aluminum Alloy About PolarStar PolarStar Precision Airsoft was formed in January 2009 to fill a need for high quality, precision manufactured airsoft components designed for performance and longevity.The 2011 release of the patented Fusion Engine HPA system marked a change in direction for PolarStar. The focus shifted from developing upgrade components within the constraints of existing systems to developing innovative HPA systems and accessories which replace the aging AEG technology.PolarStar Airsoft is a division of PolarStar Engineering & Machine (PSE&M), a unique blend of tenured American toolmakers and a full service CAE/CAD/CAM (Computer Aided Engineering, Design, and Manufacturing), special crafts machine shop keeping alive our proud manufacturing heritage of Made in the USA. Founded in 1997, PSE&M began by servicing the automotive racing industry through the design and producing systems and components from art to part. Operating under the auspices of the Delaware Association of Professional Engineers, we retain a Professional Engineer (P.E.) on staff to ensure and certify all design and engineering standards are met. In addition to our own product line, PolarStar also offers engineering and manufacturing services tailored to the airsoft industry.