For those who are not familiar with WE Airsoft's Katana Gearbox System, WE Airsoft Europe have come up with this poster explaining about the Adaptive Gearbox System, or Katana to give it a more awesome term as it represents the beautiful but deadly swords used by Samurais. Many would compare it to the System PTW series due the Cylinders and even the ICS AEGs for the split gearbox, but it's up to you to make up your mind if such system will help you in the airsoft battlefield.