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King Arms Ver.3 9mm Bearing Reinforced Complete Airsoft AK Gearbox (M120 - 380~440 FPS)

ID: 37365 (GB-KA-GB-39)
King Arms / Eagle Force37365
5.0 stars, based on 1 reviews
King Arms Ver.3 9mm Bearing Reinforced Complete Airsoft AK Gearbox (M120 - 380~440 FPS)
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King Arms Ver.3 9mm Bearing Reinforced Complete Airsoft AK Gearbox Set (M120 - 380~440 FPS)
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

    California residents click here for Proposition 65 warning

    1 Customer Review

    (Write a review)

    by Matthew L. on 09/15/2015
    "Ordered this gearbox assembly for my cheap $40 Aftermath "Kraken Kruz" (Beta Spetsnaz) AK. Works really well. I'm still not too fond of the metal piston head considering they do have a bad reputation with high fire rate systems, which is what I have my gearbox for.

    Overall: good replacement for a crappy gearbox. The one I had before in the gun was an ALL PLASTIC piece of crap, and now this King Arms beauty saved my gun from being a useless dust collector. M120 spring as promised, I clocked mine in @ 405fps and fps fluctuation of about 1-2fps. Love it, just maybe go with a regular polycarb piston head for it though!!

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