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Matrix "QD Fast Spring Change" 8mm Gearbox for M4 M16 Airsoft AEG - Front Wire
by Keenan g. Date Added: March 14, 2013
This is the best gearbox ever!!!
I put a m140 in and used a matrix magnum motor.

This shoots hard and fast with a 9.6v
You dont need to take the whole gearbox apart
To put a better spring in

Not really any i put it in a friends PDW and i had
To file parts out but its over all good.

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