Jefftron Leviathan - V3 Optical Mosfet ETU


Jefftron Leviathan - V3 Optical Mosfet ETU





The Leviathan - V3 is one of the most advanced ETU's (electronic trigger units) available on the airsoft market today.

This new Leviathan ETU has all optical sensors for better handling and durability, and built-in wireless communication for quick set up using iOS or Android smartphones!

Foam on the trigger makes the Leviathan V3 a great hair trigger too.

The new 'Unique Real feel trigger system' (RFTS), spring simulates trigger resistance like you'd experience using a real AK74. It adds secondary resistance with release after you fire. The RFTS was designed by a professional gunsmith for a more realistic feel from shooting airsoft replicas.

  • External input port and output pads serves 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 online update

The Leviathan - V3 brings endless possibilities for your gun and supports the following airsoft weapons:

  • 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

    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.
    Size Chart