JeffTron LEVIATHAN NGRS Optical M4 (Rear Wiring)

JeffTron Leviathan NGRS Optical

Leviathan NGRS Optical is an electronic ETU with Bluetooth, designed for installation in the NGRS gearbox by Tokyo Marui. Thanks to optical sensors for shot detection and fire selector, plus an ultra-short switch (only 0.13 mm), it allows for realistic hair trigger mode. The Real Feel Trigger System (RFTS) with a spring simulates the trigger resistance of a real firearm and adds reset after firing. With the JeffTron app you can configure fire modes, RoF, active braking, pre-cocking, virtual magazine and more. The input/output ports support connecting external devices like flashlights, drum mags, or empty mag sensors. The unit is protected by conformal coating. It is compatible with the original bolt catch and retains the empty mag cut-off function. It's also fully ready for brushless motors like Warhead. All app settings are saved in real time directly to the unit.

Key features

• Bluetooth programming via JeffTron mobile app (iOS/Android including smartwatches)
• Empty magazine detection (using original bolt catch lever)
• Hair trigger – response at just 0.13 mm
• Real Feel Trigger System (RFTS) – spring resistance and trigger reset
• Optical sensors for both shot and selector position
• 9 fire modes including Binary Trigger and virtual magazine
• Active braking with adjustable strength
• Pre-cocking function for instant SEMI response
• Ready for Brushless motors (Warhead, T238, Specna Arms Dark Matter, etc.)
• Full wiring included with T-DEAN connector (required for power)
• Motor + output delay mode for powering accessories like drum mags, tracer units or bolt catch sensors

Technical specifications

• Gearbox type: M4 NGRS (also known as TM SOPMOD)
• Programming: Bluetooth app (Android / iOS incl. smartwatches)
• Cycle detection: Optical sensor on piston gear
• Fire selector: Optical sensor with sticker
• Wiring: Teflon (AWG16 and AWG22)
• Voltage: 8.4–17 V (NiMH, LiPo, LiFe)
• Protection: Current, thermal, undervoltage
• RFTS support: Yes
• DSG gear support: Yes
• Accessory connectivity: Input and output port

Gearbox compatibility

• Tokyo Marui M4 Next Generation
• Tokyo Marui M4 URGI Next Generation
• Tokyo Marui MK18 Next Generation
• Tokyo Marui HK416D Next Generation
• Tokyo Marui HK416 DELTA Next Generation
• Tokyo Marui HK416C Next Generation
• Tokyo Marui SCAR-L Next Generation
• Tokyo Marui SCAR-H Next Generation
• Tokyo Marui HK417 Next Generation

Package contents

• Leviathan NGRS Optical with wiring
• Mounting screw and foam pads for gearbox
• 2× cable holders
• Selector stickers and Leviathan decals
• Installation manual (English only)

Warnings

• Installation requires advanced knowledge of how NGRS guns work.
• Strictly follow the manual instructions, including correct positioning of the gear sensor.
• Most common installation issues include incorrect sensor position, poorly applied selector sticker, and wrong piston gear height.
• The unit must be calibrated via the app before use (light level, shot cycle, selector positions).
• Download the English manual here.
• Compatible smartwatches: Apple Watch Series 3+, Samsung Galaxy Watch 4+, Google Pixel Watch, Mobvoi TicWatch Pro 5, Hublot Big Bang e Gen 3, TAG Heuer Connected Calibre E4, Montblanc Summit.