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SYSTEMA Mecha-Box (Gearbox) 1J (High Speed) for Marui M16A1 / VN (FREE SHIPPING)
SYSTEMA Mecha-Box (Gearbox) 1J (High Speed) for Marui M16-A2 / SR16 - M4 (FREE SHIPPING)
I see no difference between those two. M16 will give you rear wired and using the Spring Guide Illusion made as a rough guide, the M120 will be too hot for your requirements, and the 1 Joule spring should sit you around 300 fps. (In the gun they used to test the springs, half the gearbox upgrades were systema).
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