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Home » Accessories & Parts » HPA » PolarStar Fusion Engine/JACK/F1

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

ID: 84622 (HPA-F2V2-M4-EMG)
10001054
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EMGPolarStar

$440.00

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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.
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Model Options:
ModelARES Amoeba$447.25
ModelARES M4$448.75
ModelCYMA M14$487.00
ModelKAC LMG$438.00
ModelM249$441.00
ModelReal Sword SVD$495.00
ModelTokyo Marui M14$487.00
ModelV2 / M4 M16$440.00
ModelV2 / M4 M16 EMG Edition$440.00
ModelV3 / AK$443.00
ModelVFC HK417$455.75

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Product Description

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.

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

7 Customer Reviews

(Write a review)

by Chris U. on 05/30/2025
"I went to thw darkside and i absolutely love it. My new F2 engine is amazing.I was able to snag this when it was on sale. The price was super cheap. I paired it with a Gate Titan II
and Maxx adjustable trigger and it functions amazing. I can confirm the F2 now comes with a filtered airline connection which is a long awaited plus. Not really any bad things I personally can say about this engine other than the price but if you can wait and get it when it's on sale and combo that with a coupon code that gets you 25 off your sub total price then you get it for a steal.

I will be eventually switch most of my favorites replicas over to HPA.
by Hunter B. on 03/23/2021
"I've had this for a couple months now and I love this engine. It's in my lvoa and it shoots so constantly also far. I really recommend this if you can get it
by Max C. on 02/02/2021
"This engine is good, but I wouldn't entirely recommend it.

Pros
Efficient (Kythera is best)
Easy to use
Can be very consistent
Polarstar has awesome customer support
Closed bolt(better accuracy and trigger response)
Reduces gun weight
Enables you to use a plastic gearbox

Cons
Really expensive
Picky with buckings
Kills batteries if left plugged in
FCU connectors needed major modifications to not snap
Pretty loud
Two solenoids to break instead of one

This engine is better than the Fusion Engine since fitment and cost are better, and it doesn't need to have a QEV banjo fitting or the Amped poppet and nozzle to be efficient.
It also doesn't have all sorts of sear nonsense and semi only silliness like the Kythera, and is probably the best engine for most stuff.
That being said, I would still consider the Jack, Inferno, and Fusion Engine for other stuff, but the F2 seemed to be my best option.

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EMGPolarStar

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.

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.