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Matrix "QD Fast Spring Change" 8mm Gearbox for M4 M16 Airsoft AEG - Front Wire
by Brent S. Date Added: January 25, 2012
This is a superb concept in gearboxes! I wish they had always done them this way! However it is only made for an M4, you cannot swap out normal Ver. II selector plates or switches! The new switch is a great design and in my opinion doesn't necessarily require a mosfet in most cases unless you use a lipo. The gears and piston that come with it are more for speed then power but the spring swap-out is flawless. You may require some custom fitting and if your stock needs to screw into the block on the back you may have an issue? I can't tell for sure because I bought this trying to convert it for an MP5 and it will not work! I rate this box perfect for around 400 FPS. This is great all around but do not try and convert it for anything but an M4 because you can't!

Rating: 4 of 5 Stars! [4 of 5 Stars!]
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