Jefftron Leviathan - V2 Rear Wired With Blue Trigger





Jefftron Leviathan - V2 Rear Wired with Blue trigger

Version 1.1 brings:

  • Improved current load capacity for upgraded weapons
  • Added pads for the MAXX hop-up chamber BBs illumination or powering electric magazine
  • Moved semi and auto micro switch for better cross-manufacturer compatibility
  • Added labels to the board for easier installation
  • Clipped jumper pins between boards

Leviathan - V2 is a processor-controlled MOSFET with Bluetooth communication. It adds new shooting modes, controls RoF, pre-cocking, active braking, low battery indication, statistics... everything is controlled via an application on your smartphone (iOS and Android).

This device is fully integrated inside the gearbox version 2 instead of the original trigger contacts. Comes with completely made wires to stock with 30A mini fuse and dean T connector - no soldering needed.

Adds new shooting modes independent for every position on the fire selector (SAFE - SEMI - AUTO)

  • Three adjustable bursts (range 2 - 20 shots)
  • The rate of fire makes breaks between shots to reduce RoF. It gives fast trigger response even with a very low rate of fire, just like in a real gun
  • Adjustable strength active braking (can be disabled)
  • Pre-cocking function for an instant shot on SEMI fire
  • The delay between shots adds time in which isn't possible to shoot, it simulates the delay from gun reload or recoil (range 0,1 - 4,0 seconds)
  • Low battery indication for 2S - 4S li-pol and 3S - 4S li-fe
  • User can save multiple settings under profiles
  • Update function fixes bugs and adds new features to the device
  • The application shows the actual battery voltage value. Colour lines indicate battery charge status
  • There are three shot counters. Total count every shot during the device lifetime. The user counter can be reset by the user anytime. Power-up counter is reset by battery connection
  • Error log shows errors made during the device life
  • Leviathan - V2 monitors current, voltage and temperature to avoid any damage when something goes wrong.
  • The motor vibrates and beeps as feedback for the user
  • Programmed settings are saved in the Leviathan - V2 memory immediately after their change, so settings aren't lost when is Bluetooth or battery disconnected


Independent for every position on the fire selector (SAFE - SEMI - AUTO)

  • SAFE: no responding on the trigger pull.
  • Semi: it fires single shot per trigger pull.
  • Semi/BurstX: short trigger pull fires a single shot, long trigger pull fires burst.

Double trigger: it fires a single shot when the trigger is pulled and another single shot when is released.
- BurstX: gun shoot burst per trigger pull.
- BurstX/BurstY: short trigger press fires burstX, long trigger press makes burstX+burstY fire.
- BurstX/Full: short trigger press fires burstX, long trigger press makes auto fire.
- Full: gun makes auto fire until releasing the trigger.


  • Easy installation inside the gearbox version 2, compatible with Tokyo Marui standard
  • In most cases is no modifications needed in the gun or Leviathan - V2 - It uses micro switch actuated by sector gear for perfect semi and burst fire timing
  • CNC trigger included with the package has a screw to move its zero position. Thanks to this feature, a shot can be made by very short trigger pull, it is called "hair trigger" modification
  • Thanks to advanced electronics, Leviathan - V2 can be used with any common gearbox upgrade and gun rate of fire
  • Completely made wiring allows the fastest and the easiest installation into the gun, it is long enough for all kind of weapons with the battery placed in the stock. No soldering is needed
  • There are high-quality power wires 1,5 qmm (AWG16) with thin and hard MPPE insulation and signal blue wire 0.34 qmm (AWG24) with MPPE insulation
  • Power wires outer diameter is only 2,06 mm and blue wire 1,24 mm
  • The wire length between the gearbox and the battery connector is 290mm
  • Electronics are coated with lacquer, it protects Leviathan - V2 against water
  • For right pre-cocking function is necessary to have in the gearbox functional anti-reverse latch
  • Specified for common batteries up to 17V (Ni-xx 8.4 - 12V, lipo 7.4 - 14.8V)
  • Device increases gun rate of fire and battery holds longer than with basic wiring
  • With active braking ON piston isn't partially stretched, spring is fully released, parts in mecha box aren't under strain and nozzle locks hop-up chamber in greater part (depends on ROF)
  • In weapons with a very high rate of fire (ROF) active brake solves multiple shots in semi mode
  • The braking effect is the most powerful with high torque motor
  • Remove from the gearbox: cut off lever, trigger, trigger contacts and trigger block, you will not need them with the Leviathan - V2

Please note - Fitting this part requires gun disassembly and reassembly and should be fitted by an experienced airsoft technician.

Remember - if you don't feel comfortable carrying out your own gun servicing, repairs or upgrades, we have experienced airsoft technicians in-store and can do the work for you. You can even book a service with us online by clicking the link below!

Book a Gun Service.


To buy an airsoft weapon in the UK you must have a valid airsoft defence.

This is not a licence, it is basically just proof that you intend to buy an airsoft weapon for use in airsoft.

An airsoft defence could be a UKARA or membership with the British Airsoft Club, and various other forms of defence.

You can only obtain an airsoft defence once you are over the age of 18.

To get an airsoft defence the law is that you should play at least 3 games of airsoft, and that you must have been playing for at least two months.
You can still buy an airsoft gun without a defence, provided you are 18 or older. If you choose to do this we would, by law, two tone (paint in a bright colour) parts of your chosen weapon. This is because an airsoft gun is considered a RIF aka Realistic Imitation Firearm, because they are so close to the real steel, whereas when you paint parts of it in a bright colour it becomes an IF aka Imitation Firearm. The reason being that the bright colours make it look less realistic to the public, and therefor less likely to be mistaken as real, were it to be used for any other purpose than airsoft.

When you order a gun from us you will need to add your defence details in the comments section of the cart. If you do not have a defence you will need to write the colour that you wish to be used for two toning your airsoft weapon.

Here is what's stated in the VCRA (Violent Crime Reduction) Act:

For airsoft skirmishing, the Association of British Airsoft is putting in place arrangements to allow retailers to check that individual purchasers are members of a genuine skirmishing club or site. The key elements of these arrangements are:
1. new players must play at least 3 (three) times in a period of not less than two months before being offered membership
2. membership cards with a photograph and recognised format will be issued for production to retailers
3. A central database will be set up for retailers to cross-check a purchaser’s details
4. member’s entry on the database will be deleted if unused for 12 months.
The defence for airsoft skirmishing can apply to individual players because their purchase of realistic imitation firearms for this purpose is considered part of the “holding” of a skirmishing event.
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