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JBU Version 3 Gearbox Airsoft AEG Full Metal FPS Upgrade Kit


  • - 1x M120 Spring
  • - 1x Aluminum Steel Teeth Piston
  • - 1x Ported Aluminum Piston Head w/ Bearings
  • - 1x Full Seal Aluminum Cylinder
  • - 1x Aluminum Cylinder Head
  • - 1x Steel Ball Bearing Spring Guide
  • Compatibility: Designed for short barreled, 190mm to 400mm, Version 3 Gearbox equipped AUG, AK, G36, and MP5K AEGs. Make certain that your AEG is compatible with these upgrade components.


JBU Version 3 Gearbox Airsoft AEG Full Metal FPS Upgrade Kit

This high quality Version 3 gearbox upgrade kit features a powerful M120 spring, that is sure to raise the FPS of your short barreled, Version 3 gearbox equipped AEG, such as an AK Beta. Also included in this premium upgrade package is an aluminum, steel teeth piston head, a ported aluminum piston head, a ported cylinder, an aluminum cylinder head, and a steel bearing spring guide. If you want to maximize the performance of your AEG, this is the upgrade kit for you!

NOTE: Professional installation is recommended/may be required. Airsoft Megastore is not responsible for the installation of these components, or damage to your AEG caused by installing these components. Make sure to check the compatibility of your AEG and your AEG's gearbox with these upgraded internal parts. This upgrade kit is for full metal Version 3 Gearboxes only!

In the Box


California Proposition 65 Warning: Cancer and Reproductive Harm -

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