Jefftron Leviathan V3 ETU Optical Mosfet


Another Breakthrough from Jefftron the all-new V3 Leviathan, not only does it work with standard V3 gearbox it also works with a selection of Tokyo Marui V3 NGRS airsoft guns! Now doing away with the micro switch and going fully optical!

In stock

icon Description
Jefftron Leviathan ETU V3 optical Mosfet
The Leviathan – V3 is one of the most advanced ETU (electronic trigger unit) on the market

It has all-optical sensors for better handling and durability

Build-in wireless communication for quick setup using iOS or Android smartphones!

Foam on the trigger makes great hair trigger mode

Jefftron Leviathan ETU V3 optical Mosfet
Jefftron Leviathan ETU V3 optical Mosfet

Unique Real feel trigger system (RFTS), spring simulates trigger resistance like in the real AK74. It adds secondary resistance with release after the fire. RFTS was designed by a professional gunsmith for a more realistic feel from shooting

External input port and output pads serve for custom accessories

Real-time response for change settings -> immediately test result

Easy installation into the gearbox instead of the original trigger contacts

Completely made wiring allows the fastest and the easiest installation into the gun. No soldering is needed

New functions are for free for every user via an online update

The Leviathan – V3 brings endless possibilities for your gun!

 Leviathan – V3 supports these airsoft guns:

  • AK47, AK74, Galil, Bizon with V3 gearbox according to TM design
  • Tokyo Marui AK47 Next Generation
  • G36, XM8 with V3 gearbox according to TM design
  • Tokyo Marui G36 Next Generation
  • ASG CZ 805 BREN
  • AUG, UAR with V3 gearbox according to TM design
  • Fal/SA58 with V3 gearbox according to TM design
  • MP5K, UMP with V3 gearbox according to TM design
  • SIG 55X with V3 gearbox according to TM design
  • S&T VSS or VAL
Jefftron Leviathan V3 ETU Optical Mosfet
icon Brand

Jefftron Airsoft Mosfet

JeffTron Airsoft Mosfets JeffTron was founded in 2011 as a manufacturer of electronic devices for Airsoft Electric guns. Based in the Czech Republic, they produce some of the most popular Airsoft AEGs and accessories on the market. Known for their high quality, durability, and performance - JeffTron products are used by Airsoft players all over the world and are trusted by some of the most prestigious Airsoft teams. Read more >>
icon Specification


– Adds new firing modes independently for each switch position (SEMI – BURST – AUTO)
– Adjustable firing dose (range 2 – 20 rounds)
– Retains empty magazine detection as the original weapon
– Reduction of cadence by up to 40% with a pause between shots. This gives the shot a quick response to the shutter release, as with sharp weapons
– Adjustable power active engine braking with the possibility of off
– The pre-stretching piston for an immediate shot mode SEMI shooting (can only be used to latch the reverse which is included)
– Functions delay of the shot, when it is not possible to fire again for a certain time. It is for simulation of kickback or overcharging (range 0.1 – 4.0 s)
– Electronic fuse sets the sensitivity of current protection
– Low battery indication for 2S – 4S li-pol and 3S – 4S li-fe
– Virtual magazine simulates low-capacity magazines, when it reaches 0, the weapon stops firing. You can set a warning after each shot when the virtual magazine is almost empty
– There is an input port on the board with functions: 3-morning dose, external trigger, AUG trigger, empty magazine detection, virtual magazine overcharge, etc. And the output pads are used for lighting hop- up chambers, power supply for the electric magazine, flashlight, etc.
– Screen with statistics from firing with current consumption of the motor and the temperature of the mosfet allows you to fine-tune the assembly of the gearbox
– Display the current cadence of the weapon
– The coloured bar indicates its state of charge
– Saving parameters to profiles for quick retrieval
– Update removes errors and adds new functions for the device
– Error log shows the history of errors recorded by Leviathan
– For greater security, it is possible to turn off the wireless connection via firing switch (can be deactivated)
– Leviathan monitors passing current, voltage and temperature to avoid damage if something bad happens
– Uses vibration and motor beeps in the stock to alert the user
– Changing settings is immediately stored in Leviathan’s memory so programming is not lost when disconnected from a smartphone or battery
– New features are free for every user via the online update function


Regardless of the switch position (SEMI – BURST – AUTO)
– SAFE: does not respond when the shutter button is pressed.
– Semi: fires once when the shutter button is pressed.
– Semi / BurstX: short press fires once, hold to fire the selected dose.
– Binary trigger: Fires once when the trigger is pressed and again when the trigger is released.
– BurstX: Fires a dose when the shutter button is pressed.
– BurstX + BurstY: short press fires burstX, long-press fires sum burstX + burstY.
– Burst / Full: a short press of the shutter button fires burstX, a long press starts automatic firing.
– Full: the weapon fires until the trigger is released (AUTO).
– Virtual reload: press the virtual to reload trigger


Works with the input terminal: – OFF: Any signal on the stage is ignored. – External trigger: the trigger in the weapon is deactivated and replaced by a microswitch connected to the input (SIG and GND) – Burst-3 trigger: by pressing the microswitch, 3-morning doses are performed. The trigger in the weapon is still functional. The microswitch must be connected to the input (SIG and GND). – AUG trigger: switch detection is deactivated. The trigger in the weapon is set to “selector on a semi”. The microswitch connected to the input (SIG, GND) is set to “selector on auto”. – Empty mag (NO) : The microswitch activates empty hopper detection when a SIG with GND is connected.

– Empty mag (NC) : The microswitch activates empty hopper detection when a SIG with GND is disconnected.
– Virtual reload: The microswitch overloads the virtual reload when a SIG with GND is connected.


– Output pads are used for lighting hop-up chambers, power supply for an electric storage tank, flashlight, etc.
– These pads cannot be controlled from a mobile application. The power supply only works when the engine is running.

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icon    Delivery Times and Costs View our Delivery Times and Costs

At Socom Tactical we aim to ship all orders same working Day During our working hours. All orders before 14:00 we aim to ship the same day. Shipments are shipped Monday, Wednesday, Thursday, Friday sadly due to no collections we are unable to ship Saturdays.

Pricing and Times

UK Mainland   £6 or Free on orders over £100

Europe   £10 - Delivery 3-7 working days (Excluding any customs delays)

Rest of the World   4- 14 Working Days (Excluding any customs delays)

Additional Time There May / Will be additional delays for Remote UK, Highlands and Islands, as well as Northern Ireland typically this, adds an additional 1-2 working day

UK Shipping Methods -   Typically most orders over £30 or 1kg are sent via DPD local Next Working Day delivery. You will receive an email and/or Text message from DPD with a 2-hour delivery window. Packages under 1kg or £30 will be shipped by Royal Mail First Class Tracking number can be viewed on your account

EAN: 750122151905 Category: