Leviathan – V3 Optical Mosfet


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

It has all optical sensors for better handling and durability

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

Foam on the trigger makes great hair trigger mode

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 professional gunsmith for more realistic feel from shooting

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


– Adds new shooting modes independent for every position on the fire selector (SAFE – SEMI – AUTO)
– Three adjustable bursts (range 2 – 20 shots)
– It preserves empty magazine detection like the original gun
– 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
– Adjustable strength active braking (can be disabled)
– Pre-cocking function for instant shot on SEMI fire
– 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
– Virtual magazine simulates low capacity magazines, it will force the gun to stop shooting when it reach 0. There can be set warning after shot before empty magazine and how it will be reloaded
– On the board is input port for controlling external devices or Leviathan and output pads for powering the hop-up chamber BBs illumination, powering electric magazine, flashlight, etc.
– Statistics screen shows shooting output with cycle timing, motor current consumption, rate of fire and temperatures. It allows you to do fine-tune gearbox upgrade
– Application shows actual battery voltage value. Color lines indicates battery charge status where green is OK, orange will warn after each shot and red will not allow to shoot
– 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 also can be erased by user
– For better security wireless connection can be disable by the selector switch (can be deactivated)
– Leviathan 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 memory immediately after their change, so you can immediately test it and settings aren’t lost when is battery disconnected or lost connection with smartphone
– New functions are for free for every user via online update function


– Installation of this device into the gearbox requires advanced technician skills!
– Please read these informations 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 battery explosion.
– Disconnect battery, when you aren’t using the gun! Otherwise you will fully discharge the battery. Because the device drains small amount of current from the bettery all the time.
– Do not connect battery when gun pointing towards you, another person or an animal.
– Do not modify, repair and put into any kind of liquids or thermal shock the Leviathan – V3.

8 in stock



– Leviathan – NGRS drop-in electronic module with complete wiring to front or above the gearbox
– 2x Screw with washer for securing device in the gearbox
– 2x foams for hair trigger mode (2x 1mm height and 2x 2mm height)
– Real feel trigger system (RFTS) spring
– Sheet with selector plate stickers
– Black Leviathan sticker 40 mm
– Installation manual in English



Additional information

Weight .124 kg
Dimensions 14 × 14 × 5 cm


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