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JeffTron Leviathan Airsoft Drop-In Programmable MOSFET Module (Type: ASG CZ EVO 3 / Wired To Handguard)

ID: 20279 (Mosfet-JT-LEV-S3)
JeffTron Leviathan Airsoft Drop-In Programmable MOSFET Module (Type: ASG CZ EVO 3 / Wired To Handguard)
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  • 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 precocking, 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 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 protect Leviathan - EVO3 against water
  • Specified for common batteries up to 17V (Ni-xx 8.4 - 12V, lipol 7.4 - 14.8V)
  • 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)
Leviathan - EVO3 is processor controlled mosfet with wireless communication.

It adds new shooting modes, controls RoF, pre-cocking, active braking, low battery indication, statistics...

Everything is controlled via application in the smart phone (iOS and Android).

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 undervoltage protection,...

Comes with completely made wires to the front with Deans T-connector - no soldering needed.

Main Functions:

  • 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 reduce to 40%. It add breaks between shots to reduce RoF. It gives fast trigger response even with 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 to use pre-cocking, lower level active braking and DSG gears
  • Adjustable strength active braking (can be disabled with installed ARL mode)
  • Pre-cocking function for 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 deactived in the app
  • 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. Color lines indicates 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 user anytime. Power-up counter is reset by battery connection
  • Error log shows errors made during the device life
  • For better security wireless connection can be disable by the selector switch (can be deactivated)
  • Leviathan - EVO 3 monitors current, voltage and temperature to avoid any damage when something go wrong.
  • Motor vibrates and beeps as a feedback for user
  • Programmed settings are saved in the Leviathan - EVO 3 memory immediately after their change, so settings aren't lost when is battery disconnected or lost connection with smartphone


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 single shot, long trigger pull fires burst.
  • Binary trigger: it fires single shot when 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 trigger.

Manufacturer: JeffTron


Mobile Application: You can install it HERE
Device Instructions: You can download installation manual in English HERE [PDF, 5.76 MB]
Compatibility: For ASG CZ EVO 3 Airsoft AEG gearboxes
Package Includes: MOSFET,

About JeffTron

Jefftron company was founded in 2011 as a manufacturer of electronic devices for Airsoft electric guns.

21 Customer Reviews

(Write a review)

by Bennett K. on 10/10/2022
"I LOVE this thing, it is totally worth the money and I would absolutely buy it if you get the chance.

Pros: TONS of adjustable features (all of which are accessed through the app.)
Very straight forward install.
If something isn't working the MOSFET will tell you through the app.

Cons: N/A

Just make sure you read the instructions, they will explain everything you need to know.
by Amery M. on 05/23/2022
"Man this thing is great. The app is a little wonky but very solid overall. I haven't tried a Gate Titan to compare but this definitely feels like a top tier mofset with all the possible functionality one could require.
by Zeb N. on 08/16/2021
"This thing is awesome! I love how easy it is to adjust settings with my phone. The trigger response is amazing. The only thing that I wish was different is that you could make it a hair trigger, but the with the way the micro switch is set up is so that it can't have that short of a trigger pull. Nevertheless the trigger pull is still way shorter than your average trigger switch! I would highly recommend this MOSFET to anyone looking to upgrade! I will never go back to a regular trigger switch again!

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