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Matrix "QD Fast Spring Change" 8mm Gearbox for M4 M16 Airsoft AEG (Model: Rear Wire)

ID: 37950 (GB-M4QD-R)
4.3 stars, based on 12 reviews
Matrix QD Fast Spring Change 8mm Gearbox for M4 M16 Airsoft AEG (Model: Rear Wire)
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The new Matrix "QD Transform" gearbox is a new generation gearbox with all the unique & great features of a STAR / ARES (QR gearbox) and Deepfire gearbox (Micro switch). This gearbox has an unique shell, spring guide, selector plate, cut-off lever and trigger, all other parts are compatible with regular AEG Ver.2 8mm M4 gearboxes. Replaces all major brand M4 standard gearbox.

The Matrix "QD Transformer" Gearbox features:
  • Quick release spring and spring guide for easy power adjustment / spring replacement.
  • Quick release spring guide for easy replacement.
  • Micro switch operation for shorter & better electric range.
  • Faster trigger response design.
  • Featuring "spring release" function.
  • Quickly changes FPS from 250 FPS to 550 FPS!
  • (Note: Higher fps means higher wear and tear)
  • Full metal reinforced chassis / gearbox with metal gear set.
  • 8mm hybrid bushing / ball bearing.
  • Chrome / blue polished cylinder with low resistance silver wiring.

  • Compatibility: The Matrix Transformer Gearbox will work with most AEG M4 Platforms (Modification may be required)
    Barrel Compatibility: Will work with barrels from 250mm-590mm in length
    Manufacturer: Matrix
    Spring / Power output: M120 / ~400 FPS
    Color: Black or Silver
    Lipo Ready? Lipo batteries are recommended for experienced players. Who understand the result of high power batteries and knows how to manage the enhanced performance + wear and tear.

    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. Buyer responsible for fine tuning and proper installation. is not responsible for shimming it perfectly or playing the game of airsoft for you.
    For more information on complete gearboxes, please visit: Complete AEG Gearbox

    The following four spare parts are unique on the QD transform gearbox (included) and available here at for future reference.

    About Matrix

    Established in 2001 for Airsofters by Airsofters. Team Matrix thrive on the vision to better the sport of Airsoft with affordable high quality Airsoft equipment. With decades of experiences as Airsoft enthusiasts ourselves, we live, sleep, and breathe Airsoft. Matrix offers a wide selection of skirmish grade replicas from rifles to pistols, a wide variety of accessories, and tactical equipment from helmets to boots. It is the Matrix mission to prepare every Airsoft shooter the perfect experience!

    12 Customer Reviews

    (Write a review)

    by Donald J S. on 09/01/2017
    "Works well for the project I used it on. QC Spring is ok for replaceing the spring even if you have to break down the gun to do it. Micro Trigger switch is awesome and that should be in every AEG Gearbox in my opinion.
    by Jon Kristian K. on 08/16/2017
    "It's a vert good start. Well shimd And short triggeraction. But the piston, pistonhead, cylinderhead And airnozzel should be changed. The cylinder could also use a upgrade, but works Ok. I use this gearbox in all my AEG's. Love the quick spring change!
    by Brandon Thomas G. on 05/02/2017
    "Gearbox is solid and quiet. Shimmed perfectly. Fires great with the lonex A1 motor. Gearbox fit perfect in my m4. Only issue was getting the metal lonex hop up to seat properly.

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