Ares Amoeba EFCS ECU Gearbox Complete - Rear Wired

Product code: GB-M4E-FS-02 510005
  • Rear Wired
  • 'Blue EFCS' Mosfet
  • Complete Gearbox

A complete gearbox replacement for Amoeba / M4-E 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. .

Full description


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. The gearbox is of the highest build quality, coming with a quick release spring guide, silver wiring, electronic trigger and upgraded MOSFET. This is the perfect gearbox for if you want to start upgrading your pre-existing Amoeba or EFCS or want to switch a front wired gun to a rear wired system with no hassle


  • Rear Wired
  • Complete gear box
  • Programmable with Ares Amoeba Electronic Gearbox Programmer EFCS
  • Silver wiring
  • Magnetic selector plate 
  • Magnetic sector gear
  • Newly revised Blue MOSFET
  • Withstands 11v as standard
  • Resistant to Ampage and Voltage fluctuations
  • Suitable for LiFe / LiPo Batteries
  • Electronic trigger for instant trigger response
  • Quick spring change system
  • Bearings on Bevel Gear, solid bushings on the sector gear and spur gear

Package Includes:

  • Complete Amoeba V2 Gearbox

Special Instructions:

If you separate the two MOSFET halves and place them back together the unit will have to be reprogrammed using the EFCS control box before it can be used.



Internal Part Type
Complete Gearbox


Colour Wheel Greyscale
Item Colour
Construction Icon
Alloy with some plastic parts
Internal Part Construction
Polymer, Alloy,

Part Specific

Part for Power Source Type
Weapon Platform
AR Platform
Package Includes
Gearbox Parts

Electric Part Specific

Gearbox Icon
Gearbox Version
V2 Gearbox

Size guide

Parts Fitting

Upgrades and Downgrades should only be undertaken by experienced players, or Airsoft Technicians. Please note, changing any internal parts of a weapon voids its warranty unless done in-house by our staff. 

Please ensure that when fitting parts the part purchased is the correct part, as once a part has been fitted we cannot accept return.

We do know that players love to tinker, so we're here to give you help should you require it, and if needed you can get in touch with our workshop for more help!

Unique Parts

Please note that some parts may be unique to a specific brand of weapon. For example: Parts for an ASG M4A1 may not fit an ICS M4A1.

Parts from the same brand typically have a high chance of fitting, though be warned, some replicas use unique parts, so please ensure the part will fit before you attempt to fit it.

If you require help with fitting any parts feel free to get in touch with us via our Contact Us Page.