ARES EFCS ECU Gearbox - Rear Wired is a complete gearbox replacement for ARES / Other Brand of M4 Airsoft weapons. The unit itself is the reprogrammable EFCS unit, allowing it to be programmed for three round burst or be locked to single shot using the EFCS programming unit. The MOSFET on the gearbox is the new generation 'Blue MOSFET' which is more resistant to Ampage / Voltage fluctuations and spikes, and allows 11V LiPo and LiFe type batteries as standard.

ARES Complete Gear Boxes Rear Wire w/ ECU for Ameoba / Ares M4 Series
Electronic Firing Control System (E.F.C.S)
Allow to shoot in either, Semi / Burst, Burst / Full Auto, or Semi / Semi as well
Rear Wire
Complete Gear Box Set
Reinforced Metal Gear Box Housing
Full Steel Gear Set
Suitable Ameoba / Ares M4 Series Airsoft AEG Rifle
Also will fit in MOST brand M4 AEG

This is because some G&P and VFC bodies change depending on the model so there may be need for some modifications