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Leviathan Revision 3 - V2 Optical to Stock Mosfet- Gel Blaster Version

Product Description
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Leviathan now has optical sensors! V2 Optical to Stock Mosfet- Gel Blaster Version

The all new Leviathan Revision 3 – for V2 gearboxes is a processor controlled mosfet with Bluetooth communication. Now with optical sensors. 

Fully programmable via Bluetooth from an App on your smartphone.

Change 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 2 instead of the original trigger contacts.

Comes with completely made wires to stock and to magazine terminals with mini fuse and deans T connector.

The Leviathan has 2 x mosfets which have the highest rated current carrying capacity on the market. A fully programmable microprocessor controls the driving and braking mosfets. The microprocessor also analyzes the operation to provide crucial data required to fine tune your equipment and logs faults to aid in diagnosing operational errors should they occur. Fault logs are saved on the device and can be viewed via the app.

The Leviathan has a built in temperature sensor and adjustable electronic fuse to prevent damage from overloading. As a further failsafe to protect the device and battery from short circuit a micro blade fuse is fitted in the battery wires.


Gel Blasters place a much higher demand on equipment compared to AirSoft which becomes obvious when using inferior products. Our version of the Leviathan comes with the additional wiring for gel blaster fitment.

Whilst optical sensors that are used on other brands of FCU (Fire Control Unit) might be suitable for AirSoft they are limited in Gel Blasters….. why?

Gel Blasters are frequently used in Full Auto because the ammunition is cheap and environmentally friendly, also because it’s fun and to hit anything you need to shoot a lot more gels!!

Constant and rapid cycling of the Mechbox creates excessive heat and wear on internal components without adequate lubrication. Optical sensors fail to operate when obscured by lubricants, subsequently using such devices means you cannot adequately lubricate a mechbox with an FCU that uses optical sensors.

The Leviathan uses mechanical switches that operate flawlessly when covered in lube. We have Blasters that have worn out gear sets, motors, pistons and about every other moving part but the Leviathan keeps on operating flawlessly.


The Leviathan comes with a mini-blade fuse and an electronic fuse to protect your investment from damage due to overloading.


The Leviathan comes with an Adjustable CNC trigger made by RetroArms. A set screw adjusts the position of the trigger and the degree of movement required to fire your blaster. Fine tune this to suit your requirements. there are a range of different color and style triggers available on this site.


There’s literally way too many to mention and you’re probably going to Google it anyway but here’s a brief run down:

Significant improvements of R0F and ability to pull larger springs with less heat created over standard equipment.

Increase the life of LiPo batteries and protect them from damage and from blowing up.

Fine tune your equipment on the fly, at games or during testing instantaneously via app control from your smartphone using Bluetooth. This feature is unique to the Leviathan and makes achieving the best operating parameters for your blaster simple and quick.

View statistics on power consumption, R0F and a whole range of data crucial to tuning your equipment via the App in real time.

NOTE: the Leviathan DOES NOT have to be connected to the App to operate. The App is for measuring and adjusting only. The App is available for Android and iOS. Search Google Play or in the App store for “leviathan by Jefftron”.


- Leviathan - V2 optical drop-in module with complete wiring to stock

- Screw to secure it in the gearbox

- Various CNC trigger with hair trigger feature 

- Foam to keep device in place

- Sheet with selector plate stickers

- Leviathan black 40mm round sticker

- Instruction manual.


The Leviathan is fully covered by manufacturers warranty when used in Gel Blasters. Other brands of FCU’s will not cover the warranty after magazine circuits have been soldered to their device.

ViperTac is an authorised dealer and can provide the service, support and process warranty claims locally for all units purchased through us and our local retail stores.

Products purchased directly from Jefftron will have to be sent to Jefftron for warranty claims.


We have found a great deal of aftermarket motors to be faulty from new. Motors that have not been adequately insulated at the factory can cause a short circuit which will damage the Leviathan during operation.

We strongly recommend that ALL motors new or old are thoroughly tested prior to installation to avoid causing damage that is NOT COVERED by warranty.

At the very least remove the brush contacts from the motor and ensure there is no continuity between the two brush plates.

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