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Matrix / AIM Lipoly Ready 8mm Complete Gearbox for M4 / M16 series Airsoft AEG ( M120 / Front Wiring)
[GB-Monster-120F]
$110.00
by Daniel F. Date Added: Thursday 25 December, 2008
Probably the best gearbox I have ever used. From looking at it you can tell the shell is much thicker than most stock gearboxes just like the systema one, and it has 8mm ball bearing which I believe is the biggest possible bearing size you can put on a gearbox, making it super reliable. If you are looking for a complete gearbox for your M4, get this one!

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