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Army Force 8mm Complete QD M4 Gearbox Ver.2 Rear Line (13:1)
[AS5912]

$68.99

This is the best gearbox I found. Quality/price is this gearbox the best.
But there is always the same part who is broken after 100-300 shots : The piston.
Don't forget to change the original piston before using this gearbox if you won't change all gears (I recommand the SHS blue piston with 14 steel teeth).
With a Madbull Black Python 6.03 and a Prometheus Hop Up, velocity is about 290 fps in high speed (10cm precision in 70m).
Much better than the Energy gearboxes from Systema, and lower price.
Sorry for my bad english, I normally speak french.
Date Added: 04/11/2015 by Stive Houmard
 
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Disclaimer: All airsoft guns, gas blowback guns, spring guns are NOT real firearms. All airsoft guns sold to US customers are affixed with an orange tip permanently.