Jefftron Leviathan – EVO3 Airsoft Mosfet


Got a Faulty ASG Evo MOSFET or want increased performance and features? The Jefftron EVO-3 Mosfet is that you need. with Bluetooth connectivity which you can edit all settings as well increased reliability over the standard unit.

In stock

icon Description

Jefftron Leviathan – EVO3 Airsoft Mosfet


Jefftron Leviathan – EVO3 is 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 application in the smartphone (iOS and Android).
The device is fully integrated inside the gearbox version ASG EVO 3 A1 instead of the original electronics.
It keeps all functions as original electronics – empty magazine detection, bolt catch, burst fire, battery under-voltage protection,…
Comes with completely made wires to the front with dean T connector – no soldering needed.

Jefftron Leviathan Programmable Mosfet
Jefftron Leviathan Programmable Mosfet

– Adds new shooting modes independent for every position on the fire selector (SEMI – BURST – AUTO)
– Three adjustable bursts (range 2 – 20 shots)
– Rate of fire can be reduced to 40%. It adds 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
– In the package is included ARL mode set to make anti-reverse latch which allows using pre-cocking, lower level active braking and DSG gears
– Adjustable strength active braking (can be disabled with installed ARL mode)
– Pre-cocking function for an instant shot on SEMI fire (can be used only with installed ARL mode)
– Bolt catch lever has to be pulled after battery connection, which simulates load the bullet into the barrel like in the real gun
– Empty magazine sound indication and bolt catch lever can be deactivated in the app
– 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)
– Electronic fuse set sensitivity for high current detection to avoid any damage if something goes wrong
– Low battery indication for 2S – 4S li-pol and 3S – 4S li-fe
– Statistics screen shows shooting output with cycle timing, motor current consumption, rate of fire and MOSFET temperature. It allows you to do fine-tune gearbox upgrade
– Application shows actual battery voltage value. Colour lines indicate battery charge status
– User can save multiple settings under profiles
– Update function fixes bugs and adds new features to the device
– There are three shot counters. Total count every shot during the device lifetime. 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
– For better security Bluetooth can be disabled by the selector switch (can be deactivated)
– Leviathan – EVO 3 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 – EVO 3 memory immediately after their change, so settings aren’t lost when is Bluetooth or battery disconnected

 Jefftron Leviathan Evo 3 FIRE MODES:
Independent for every position on the fire selector (SEMI – BURST – 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.
– Binary trigger: it fires 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.

TECHNICAL SPECIFICATIONS For the ASG replacement upgraded Mosfet:
– Easy installation inside the gearbox version ASG EVO 3 A1
– No modifications is needed in the gun or Leviathan – EVO3
– Compatible with Scorpion EVO 3 – A1, Scorpion EVO 3 – A1 B.E.T., Scorpion EVO 3 – A1 carbine with gearbox gen.1, version 2018 and version 2020
– Compatible with stock and CNC trigger
– Installation ARL Mode: with anti-reverse latch, you can use pre-cocking, lower level active brake and DSG gears
– It uses micro switch actuated by sector gear for perfect semi and burst fire timing
– Thanks to advanced electronics, Leviathan – EVO 3 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 front. No soldering is needed
– There are high-quality wires 1,5 qmm (AWG16) with thin and hard MPPE insulation
– Wire outer diameter is only 2,06 mm
– Board is covered by conformal coating, it protects Leviathan – EVO3 against water
– Specified for common batteries up to 17V (Ni-xx 8.4 – 12V, lipol 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 mechabox 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, stock electronic, you will not need them with the Leviathan – EVO 3

Mobile application Leviathan by JeffTron to iOS and Android smartphone
Installation manual to Leviathan – EVO3 in English [PDF, 5.76 MB]
Leviathan by Jefftron Q&A discussion forum on Facebook

– Leviathan – EVO3 drop-in electronic module with wiring to front, DeanT connector
– ARL Mode: Anti-reverse latch, spring and special screw
– Two plastic washers under screw for securing device in the gearbox
– Black Leviathan sticker 40 mm
– Foam to keep the device in place
– Installation manual in English

– Installation of this device into the gearbox requires advanced technical skills!
– Please read the information before installing your device to prevent any damage.
– Short circuit or incorrectly connected battery will cause immediate damage to the device which is not covered by the warranty. It can lead to fire or even a battery explosion.
– Disconnect the battery, when you aren’t using the gun! Otherwise, you will fully discharge the battery. Because the device drains a small amount of current from the battery all the time.
– Don’t connect battery when gun pointing towards you, another person or an animal.
– Don’t modify, repair and put into any kind of liquids or thermal shock the Leviathan – EVO3.

Jefftron Leviathan processor mosfet with trigger
Jefftron Leviathan processor mosfet with trigger



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     Interest Free Finance Available 0% APR finance available on orders over £30

Paypal Pay in 3 

Socom Tactical are pleased to announce we are able to offer 0% interest-free finance on all orders to Paypal customers

For full information please check out our finance page

Choose Pay in 3 at checkout where PayPal is available, and enjoy the power to split your purchase into three interest-free payments, with no set up fees or charges.* It’s a great way to help you stay in control of your budget.
paypal pay in 3 Pay in 3: Easy as 1-2-3…
  1. Check out with Paypal
  2. Choose “Pay in 3” and complete your order
  3. Make the first payment now, the rest in two payments every month on the same date.
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