The G&G GK5C airsoft gun is very unique and rarely seen on the field. It is the airsoft version of the Swedish AK5C, which is an evolved version of the FN FNC.
The GK5C uses a V2 gearbox, but it has a few external modifications to support the unique dual selector plate implementation for the ambidextrous fire select levers. It also uses a rear gearbox pin that has been moved to a custom location, so an additional pin through hole is added to the GK5C gearbox.
Converting the GK5C to use the PolarStar Fusion Engine required a few extra modifications to support the ambi fire select levers. Part of the top selector plate guide rail on the left side of the Fusion Engine had to be milled away to make clearance for the selector plate.
On the right side, custom mount holes were added and the right selector plate was modified to use the new mount points.
The rear body pin is in a custom location, and unfortunately, this location is right where the Fusion Engine solenoids are located. So the rear body pin was omitted. Instead the holes were covered with self adhesive foam pieces. The lower receiver is molded in such a way that it holds the Fusion Engine very securely using the grip screws and the rear stock bolt, so the rear pin wasn’t really needed anyway.
The GK5C uses a split hopup like the KWA and JG guns (unfortunately) and it requires a custom length nozzle. Quite a bit of chamfering was needed on the hopup BB feed tube and upper section to make sure there was a clear pathway for the BBs to feed.
The gun has an interesting design that allows the front hand guard to be opened by pushing a lever on the right side. The FCU and battery can be located in this space, though it’s a relatively tight fit with the outer barrel and dummy gas tube.
Overall, though, the Fusion Engine works well in the GK5C, and with a bit of customization, the ambidextrous selector functionality can be maintained. With the PolarStar Fusion Engine, the GK5C gun can turn into a top performer on the field and set itself apart even further in a world crowded with a ARs and AKs.
Happy Airsofting!
– Rudy
- Split hopup design
- Front hand guard
- Front hand guard locking lever
- Location for the FCU and battery
- Stock gearbox, right side
- Stock gearbox, left side
- Fusion Engine and Stock Gearbox
- Fusion Engine with left selector plate
- Fusion Engine with right selector plate
- Rear pin hole covered
- Rear pin hole covered
- Nozzle length
- Hopup access
- Left side of gun
- Left side fire select
- Right side fire select
- G&G GK5C Fusion Engine Conversion
- G&G GK5C Fusion Engine Conversion