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Matrix "QD Fast Spring Change" 8mm Gearbox for M4 M16 Airsoft AEG - Rear Wire

ID: 37950 (GB-M4QD-R)
4.0 stars, based on 4 reviews
Matrix QD Fast Spring Change 8mm Gearbox for M4 M16 Airsoft AEG - Rear Wire
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Matrix "QD Transform" 8mm Metal Gearbox w/ QD Spring Change for M4 / M16 Series Airsoft AEGs

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.

    4 Customer Reviews

    (Write a review)

    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.
    by Raquel R. on 04/24/2015
    "This is a great gearbox for the money, however it has it's many pros and cons to it.
    Cons: tight fit in guns reciver ( g&g cm )
    : it has selector switch issues, can be easily fixed
    : spring isn't m120
    : some of the body pin holes army the right size way to small
    Pros: decently shimmed gearbox
    : nice gears
    : it's a qd spring change that's a huge pro !
    : very sturdy gearbox with a lot of heft
    : nice Matt finish but my gearbox came with a purple cylinder ( that's ok)
    All in all it's a OK gearbox but it still holding through perfectly, do t buy this with no tech xp
    by traci B. on 10/05/2013
    "i got the gearbox yesterday and it seemed pretty good when i was looking it over but when i tried to put it in my gun the tirrger would not go as far back as it need to in order to go in my gun i sanded the trigger hole till i was able to put it in but then it would only go on semi and my hop up would not fit around the nossle i am sill trying to get to work correct the spring guide is also plastic it seems like o good box you just need to be ready to modify the gun or the box. i will try to put more as soon as i get it to work correct. i did change the spring before i tried to put it in my gun and it was a lot easier then taking the hole thing apart

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