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Pre-Order ETA December 2020 Polarstar F2 HPA Engine for Airsoft Rifles (Model: V2 / M4 M16)

ID: 78070 (HPA-F2V2-M4)
5.0 stars, based on 3 reviews
Pre-Order ETA December 2020 Polarstar F2 HPA Engine for Airsoft Rifles (Model: V2 / M4 M16)
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This is a pre-order item with an ETA (estimated arrival) of December 2020

A pre-order item is an up coming new product, or an item in the process of being restocked to the platform by it's manufacturer.By pre-ordering an item, you will have reserved the inventory availability to receive it before the goods arrive. All pre-order items are eligible for a full refund at any time during the waiting period; simply call or drop us an email with the order # and the pre-order item you would like to cancel for an immediate refund. Due to circumstances such as US customs inspection, factory delays and other situations out of our control, all ETAs (estimated time of arrival) are estimated to our best ability and are subject to change.


  • 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.

3 Customer Reviews

(Write a review)

by Rhys C. on 08/26/2019
"I wanted to get into the HPA world when I saw the performance that was out there for this sport. I started off by getting a wolverine inferno, and I had issues from the start. I saw that wolverine had a closed bolt systems and got my hands on the premium edition. Once again I was extremely disappointed in the performance. Customer support at wolverine didn't really have any solid advice and I was about to give up all hope.

Until Polarstar released the amazing F2! My team tech was the first to switch completely from wolverine and got his F2 first. When he put it in his Krytac PDW and I saw that he was shooting over 250ft with .36g BBs, I was sold. My whole team quickly ripped out the wolverines and put an F2 in all our primaries. I have had zero issues with the FCU or engine. I love how on the FCU I can quickly make adjustments if needed. But out of the box this thing would go through anything and keep trucking.

Sometime during my first year of game play my FCU digital read out busted. Most likely because I kept everything in the pistol grip of the M4. I had purchased another used F2 that needed some work done on it and was going to throw it in another gun. I called Polarstar to see about sending in my broken FCU and the 2nd F2. Mr. Rambo let me know he was going to be at the Ballahack Polarstar event that weekend, and I was also going to be there. I brought everything to him, he took a look at it, and fixed it right there that day! Wow the customer support! I will always run Polarstar from now on!

Thank you Polarstar for making a great product and giving great customer support. I am now running BLS .43g BBs at 400FPS making shots in tight grouping at 300ft. Barrel is r-hopped, lapped, maxx hopup unit, modify bucking. mags are PTS EPM with upgraded followers. MRS regulator. Krytac CRB shell and gearbox. Titan Lithium-ion battery.
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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This is a pre-order item.

Pre-order estimated arrival: December 2020

By adding a pre-order item to your shopping cart, you will guarantee yourself to have the item reserved before they are offered as an in-stock item. Often, you will also save on shipping while not risking a rate item being sold out before you have a chance to buy it. Being the largest Airsoft distributor in the America continent, is the gateway for many exciting items entering the Airsoft world. All pre-order items are tagged with our best estimate on arrival times factoring in manufacture delay, us custom examinations and other factorys to the best of our ability. The goods on pre-order generally arrive before they are past due or on-time 99% of the time. All pre-order items are processed subject to item availability on a first-come, first serve basis. All orders and payments are processed at the time of payment. Buyer reserve the rights to a full refund on any pending pre-order items at any time.

This item is currently Sold Out. Most out of stock items are restocked within 1-3 weeks. Some items may take longer. Please add this item to your wishlist to keep posted on its availability.

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