PolarStar Fusion Engine

The original HPA conversion. Unmatched performance and adjustability in a complete gearbox replacement.

What is the Fusion Engine?

Designed to answer the demands of today's hardcore airsoft player, the patented Fusion Engine is one of the most reliable, high performance airsoft systems available today. No matter if you need a high fire rate CQB setup or a high velocity sniper platform, the Fusion Engine can do it all without sacrificing dependability or trigger response. Constructed from CNC machined aluminum our system is extremely durable and is even capable of operating under extreme temperatures without decreased performance or reliability.

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.

The Fusion Engine is available in 4 different models shown below: Version 2, Version 3, MG (Machine Guns - Convertible between M249, M60 and PKM) and M240B. These allow the Fusion Engine to be installed in a wide variety of replicas.

MG (M249 Shown)

Velocity Range: 280 - 550 fps w/ .2g (Green to Red nozzle, 6.05x375mm barrel between 80-120psi)

Operating Presure: 80-120 PSI

Compatibility: V2, V3, Machine Guns (M249, M60, PKM), M240B

  • The Fusion Engine is available in 4 different models to fit many popular guns.
  • Low Flow Poppet Assembly for Increased Efficiency
  • Plugboard for custom wiring.
  • Wire harnesses are available in 7.5", 13" and 18" standard lengths
  • Will the Fusion Engine fit my gun?

    If your gun uses a TM spec Version 2 or Version 3 gearbox then the Fusion Engine will likely fit. In addition to V2 and V3, the FEMG models are compatible with machine guns using the M249-style gearbox and variations of it. This includes the M249, M60 and PKM.

  • Are there aftermarket upgrades for the Fusion Engine?

    In addition to accessories made by PolarStar there are a number of aftermarket parts for the Fusion Engine. These include airlines, poppet shim kits, Quick Exhaust Valves.

  • What is the warranty for the Fusion Engine?

    All models of the Fusion Engine are covered by a 6 month warranty against defects in materials or manufacturing.

AK, ECHO 1 (O2B)
SR-25, G&G
SR-25, A&K

About Us

PolarStar Airsoft was formed in 2009 as a part of PolarStar Engineering & Machine with the goal of bringing our engineering experience and focus on quality to airsoft. Since then, PolarStar has made innovative airsoft products of the highest quality, designed and manufactured in the USA.

PolarStar products, including the patented Fusion Engine are designed by airsoft players, incorporating airsoft experience with the feedback of the commnity.

Latest News

PolarStar F1Posted 2016-05-13
HPA Speed TriggerPosted 2016-06-23


PolarStar Airsoft
5 Garfield Way
Newark, DE 19713
P: (302) 449-4866