Bullpup rifle owners, don't get hopes up yet that your AEGs can now take in gearbox from PolarStar Airsoft yet as most of the airsoft guns that you see using the PolarStar Fusion Engine are fully custom work either done by the players or a really good custom airsoft shop like Bingo Airsoft Works. Bingo Airsoftworks have already achieved a lot of models already using the Fusion Engine, and they also did work on the Real Sword Type 97 AEG, which is also a bullpup rifle.

It's PolarStar Airsoft's turn to prove that they too can do their own customization and chose what seems to be a winning design from APS ---  their Urban Assault Rifle (UAR). It looks like a short rifle that's very maneuverable in CQB games, but it does sport a longer inner barrel than SMGs and other rifles, which means also longer reach elegantly housed in a bullpup rifle that gives a shorter, low profile look.

According to PolarStar Airsoft, the APS UAR uses a Version 3 gearbox and with AK-type trigger which is operated in a way that made it possible for the Version 3 gearbox to be used in a bullpup configuration. Thus, it also means that the UAR is ripe for being ripped-off of its innards to put it cruelly, and install the PolarStar Airsoft Version 3  Fusion Engine.

It wasn't exactly a perfect fit as the design of the UAR was done without the PolarStar Version 3 Fusion Engine in mind… "The only thing keeping the UAR from being a match made in heaven is how the gearbox is secured within its body. The gearbox is only held in by a single screw which connects the hop-up chamber to the front of the gearbox through the shells front screw hole. Since the Fusion Engine doesn't have a shell we have no hole for said screw."

It is very much feasible to install the Fusion Engine, and PolarStar Airsoft plans to make it easier for you to do it yourself as they are now working on prototypes to make sure that you get an installation kit right in time for summer, when the airsoft action heats up.

For further reading about this project, go to the PolarStar Airsoft's "APS UAR PolarStar Conversion" blog entry.