Login
Start Free Trial Are you a business?? Click Here

PolarStar Fusion Engine V2 M4 | Red Poppet and Nozzle Reviews

4.6 Rating 8 Reviews
Read Amped Airsoft Reviews


Our Fusion Engines now come standard with a Red Nozzle and Red Low Flow Poppet for increased air efficiency and performance! This is typically a $52 upgrade, that now comes standard with our Engines! 
Polarstar - Fusion Engine Low Flow Poppet (Red/.0625)
PolarStar Red Fusion Engine Nozzle | HPA Internal Upgrade (10000643) (M4)
Have you ever dreamed of Polarizing your MP5, G3 or SCAR? With the introduction of the GEN3, now you can! At first glance the GEN3 FEV2 looks very much like the GEN2 and, for the most part, the two are quite similar. However, unlike its predecessor, the FEV2 GEN3 is no longer just for the M4/M16 series rifle. We applied the same concept used with our Version 3 Fusion Engine™ so that it is now able to interface with the selector plate and related components of your existing AEG’s gearbox. This makes it possible to adapt the engine for use in multiple rifle models which share the Version 2 gearbox without any major modification.The FEV2 GEN3 will come complete with a M4/M16 series trigger and steel selector plate so that it can be installed into any M4/M16 series AEG which is Tokyo Marui compatible. However, by installing a different nozzle or rifle specific conversion kit, you will be able to expand the number of rifles it will be compatible with. In most cases all you’ll need to do is change out the trigger and selector components with ones from your AEG, install a different Fusion Engine™ nozzle, and the engine is ready to use in a completely different model of rifle.The internal operation of the GEN3 FEV2 and the GEN2 FEV2 cylinder assembly are exactly the same and share many of the same parts, so it offers the same stellar downrange performance and rock solid reliability as its predecessor. This GEN3 does however feature a new side plate design to accommodate the AEG selector plate and is equipped with a new electronic switchboard. One advantage to this new design is that the switchboard offers a wider contact point with the selector plate to allow for varying tolerances in the rifles selector assembly making for improved out-of-the-box compatibility with an increased number of rifle brands.As requested by many of our fans, the FEV2 GEN3 will come standard with our newly redesigned “Milsim Manifold”. This feature enables the user to install an optional 90 degree fitting inside of their engine allowing the air line to be routed to the rear of the engine and exit through the buffer tube sling plate on an M4 series rifle.As with all of our engine models, you can quickly change and adjust key functions of the engine via the on-board FCU (Fire Control Unit) which is no bigger than an AEG's MOSFET and can easily fit inside of a rifles battery compartment along with a small Li-po battery. Using the FCU's five position joystick and LCD display you will be able to easily adjust such functions as the systems cyclic rate, fire modes and nozzle timing on the fly.With the Fusion Engine™ in your rifle you will also be able to adjust its muzzle velocity via the remote air rig (sold separately). Adjusting the PSI output on your air rig will allow you to fine tune your rifles muzzle velocity so you will always be able to get it exactly where you want it. And then for larger velocity changes we offer a series of air nozzles with varying bore sizes to shift the velocity adjustment range up or down to best meet your requirements.The best part is that our system is extremely user friendly. Even if you have only the basic understanding of an airsoft rifle, you will find that operating and manipulating this system is very simple and does not require a degree in airsoft engineering to figure out.Key FeaturesDesigned, manufactured and built in the U.S.A..Assembled from CNC machined aluminum components.New GEN3 design now interfaces with AEG triggers and selector plates for cross compatibility with many different models.Capable of functioning in damp and sub-freezing climates without affecting performance or reliability.User selectable Semi/Full Auto, Semi Auto Only and Variable Burst modes.Open Bolt and Closed Bolt firing modes.Independently adjustable velocity and cyclic rate.Auto Switch mode allows for proper selector configuration for specific models.Interchangeable air nozzles to shift the velocity adjustment range up or down.Adjustable nozzle dwell and return to battery times to optimize feeding from any magazine.Easy to use Fire Control Unit (FCU) with LCD display and five position joystick.Uniform shot-to-shot air volume discharge allows for unmatched velocity consistency.Instantaneous trigger response. Faster than an AEG with a Li-po!Interfaces with stock AEG barrel/hop-chamber allowing for aftermarket barrel upgrades and the use of traditional AEG magazines.Required for operation: Complete TM Spec AEG rifle (less gearbox and motor), Air Rig, HPA Tank, Battery(CO2 and Propane cannot be used to power the Fusion Engine™. Using liquid propellants such as this can result in damage to the system.)
Disclaimer: Picture shows Fusion Engine with Blue Nozzle. Will be updating this picture to the red nozzle FE shortly! Thanks! 

Visit Product Page
Installed in a G&G ARP9 with very small modifications to firing plate and internal structure of gun frame. Very easy install. Works very well as expected as I have another in a DDMK18. Love it!
Helpful Report
Posted 1 year ago
Very nice!! Looking good on the setup - thanks for the photo review :)
Posted 1 year ago
The polarstar fusion engine V2 m4 that I installed in my sons gun made him go from just another player to the player everyone wants on their team. The flawless action of the polarstar fusion makes playing a lot more fun and easy. Knowing that you don’t have to worry about your gun’s performance lets you turn your focus to your opponent. WIN WIN!!!
Helpful Report
Posted 1 year ago
So epic! Awesome dad and great review!! Thank you :)
Posted 1 year ago
If you are looking to go hpa this is the way to go, drop in engine makes the switch very easy!
Helpful Report
Posted 2 years ago
We love the FE too!
Posted 2 years ago
This was my first taste of hpa and it was worth every penny. It’s pretty costly for an average player but it’s a good investment depending on how much you actually play. My package arrived quick and neat. Customer support was also tons of help. I highly recommend any hpa upgrade from amped those guys rock!!!:sign_horns:
Helpful Report
Posted 4 years ago
It is kind of a let down that these will not fit in a mil-spec lower/buffer tube, but I switched it to an APS lower and fit in perfectly. This is the first thing I would get if your going to go HPA. Would seriously recommend!
1 Helpful Report
Posted 6 years ago
Boyfriend loves it! Thanks!
Helpful Report
Posted 7 years ago
Hello, Actually i'm not so happy with this purchase. The engine arrived in not working condition. Today it was my first game with the engine in my new G&G HK416 and i had a lots of air leaks! I hope that the problem is coming from the Red Poppet! I will open it tomorrow to check and to re-lube the poppet.otherwise i will send it back to you and i will as refund! You see that ,when you buy something for 500 USD and when you receive it in non working condition it's not satisfying at all! I will keep you updated about the situation. Regards Dob
2 Helpful Report
Posted 8 years ago
Dob, Thank you for your feedback! This is concerning that you are having a leaking issue with your fusion engine. When you are able, can you please provide us with a video of the leaks you are encountering as well as pictures to sales@ampedairsoft.com. We will then assess the situation and work with you to contact PolarStar for warranty service as your product is under warranty. We work with PolarStar to remedy any warranty issues and would like to get you taken care of ASAP. If you have any questions, please let us know. We will look forward to getting your system straightened out and take care of any concerns you may have. Thanks!
Posted 8 years ago
This item is the Best!!! Fit into my G&P m4 perfect.
Helpful Report
Posted 8 years ago