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Polarstar F2 HPA Engine for Airsoft Rifles (Model: V2 / M4 M16 EMG Edition)

ID: 84622 (HPA-F2V2-M4-EMG)
5.0 stars, based on 2 reviews
Polarstar F2 HPA Engine for Airsoft Rifles (Model: V2 / M4 M16 EMG Edition)
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$435.00 $413.99

MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.


  • 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.

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.

Operating Pressure 45 - 145psi
Velocity Ranges: 205fps - 500fps
Length: 4"
Compatibility: Most V2 gearboxes
Material: Aluminum alloy

Manufacturer: PolarStar Airsoft

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.

About EMG

The EMG vision is to manufacture products the world has never seen before; products we would put our name on, and products that hit the spot! "EMG" (Evike Manufacturing Group) was spawned from the realization that if you want something done exactly the way you want it, you need to do it yourself, and we did just that.
We took our 16 years of knowledge as the market's lead retailer, our network of 300+ superior manufacturers, to work with inspiring top innovators in the firearms industry. That combined with the vision to invest into the Airsoft industry, an industry we believe in, EMG was born.

2 Customer Reviews

(Write a review)

by Devin Y. on 07/12/2018
"i installed this into my Krytac trident MK2 CRB and i absolutely love it i had i few problems in the beginning but all well worth it in the end. i had a faulty micro switch on my trigger board but i called polarstar and they sent me a new one for free. But one tip i have is to make sure non of the wires are touching your trigger then youll have trigger problems

duel solenoid
fairly easy to install
via secondary regulator and fcu tuning u can play with extreme performance at any fps
tuning is not necessary original settings are quite conservative and will work no matter what

tuning can take a long time but is well worth it in the end
the trigger board does not fit in a krytac gearbox so u will have to dremel out some space for it if u want to put it in a krytac (i recommend emailing polar star and asking them how or if it will fit in your gun)
by Michael L. on 04/07/2018
"Just as described by Polarstar. Great step up from the F1 and JACK single solenoid engines by being more customizable and tunable while still being considerably cheaper than a brand new Fusion Engine. Having personally used the EMG edition of the Polarstar JACK for almost four months now, the F2 is easily more efficient than the JACK.

Dual solenoid (requires some more tuning than single solenoid systems to achieve best performance, but still overtakes single solenoid engines)
More efficient than some other single solenoid cylinder engines like the JACK
Full size FCU
Easy to install

The wiring on the solenoid on the top that moves the nozzle can sometimes get detached by the spring guide if you have one in your gearbox.
Requires some time to tune, especially for players upgrading from single solenoid systems.

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