Pre-Order ETA November 2015 King Arms Ver.3 9mm Bearing Reinforced Complete Airsoft AK Gearbox (M120 - 380~440 FPS)

King Arms / Eagle Force37365
5.0 stars, based on 1 reviews


Model: GB-KA-GB-39

1 Customer 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!!
Pre-Order ETA November 2015 King Arms Ver.3 9mm Bearing Reinforced Complete Airsoft AK Gearbox (M120 - 380~440 FPS)
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

    This is a pre-order item.

    Pre-order estimated arrival: November 2015

    By adding a pre-order item to your shopping cart, you will guarantee yourself to have the item reserved before they are offered as an in-stock item. Often, you will also save on shipping while not risking a rate item being sold out before you have a chance to buy it. Being the largest Airsoft distributor in the America continent, is the gateway for many exciting items entering the Airsoft world. All pre-order items are tagged with our best estimate on arrival times factoring in manufacture delay, us custom examinations and other factorys to the best of our ability. The goods on pre-order generally arrive before they are past due or on-time 99% of the time. All pre-order items are processed subject to item availability on a first-come, first serve basis. All orders and payments are processed at the time of payment. Buyer reserve the rights to a full refund on any pending pre-order items at any time.

    This item is currently Out of Stock. Most out of stock items are restocked within 1-3 weeks. Some items may take longer. Please add this item to your wishlist to keep posted on its availability.

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