King Arms Ver.3 9mm Bearing Reinforced Complete Airsoft AK Gearbox (M135 - 400~500 FPS)


Model: GB-KA-GB-40

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King Arms Ver.3 9mm Bearing Reinforced Complete Airsoft AK Gearbox (M135 - 400~500 FPS)
Please note this "High performance / High power output" gearbox is designed for advanced players only. Due to high power output, this gearbox may require very frequent up-keep, strong battery and tech knowledge to wield. There are no further warranty covering gearboxes over M120 power due to the nature of high power gearboxes. This King Arms Version III Complete Gearbox is rear wiring and designed for AK Series AEG. All King Arms complete gearbox are tested by our techenian and it is ready to be installed to your AEG directly. It equipped with 9mm bearings, silver cords, AK selector plate and M120 spring.

Approximate FPS output: 380~440 FPS
Weight: 490g
Material: Steel / Zinc Alloy / POM
Manufacture: King Arms.
Applications: For AK, AK47, AK74 and other compatible AK Series Airsoft AEG

  • Reinforced Gearbox Shell
  • Reinforced Gear Set
  • 9mm Steel Bearings
  • POM Gear Sector Clip Installed
  • Rear Wiring Switches Set w/ Silver cords
  • POM Hard Piston w/ 7 Metal teeth
  • Metal piston Head w/ Bearings
  • Cylinder For 450~550mm Inner Barrel
  • POM Cylinder Head
  • Durable Tappet Plate
  • Metal Anti-Reversal Latch
  • Spring Guide w/ Bearings

  • Complete Gearbox Disclaimer:
    We have compiled a series of videos for AEG take down, assembly and gearbox for your reference. Recommended for experienced players only. A "gearbox" virtually never breaks, offers spare parts for all components. All gearboxes are sold as complete set of parts and "AS IS". All the gearbox are directly from manufacture. Buyers are responsible for fine tuning, playing the game and proper installation. is not responsible for shimming, installation or playing the game of airsoft for you.
    For more information on complete gearboxes, please visit: Complete AEG Gearbox

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