About ASTER V3

ASTER is a younger brother of our famous high-end TITAN ETU, designed to give you a tactical advantage at an attractive price. Our 4th generation Control System will give you maximum reliability and protection together with tons of useful functions such as binary trigger, burst mode, active brake, and other essentials.

One of the biggest advantages of ASTER V3 is the optical trigger sensor - the same as in TITAN V3! Unlike mechanical switches, which can be prone to faults, optical sensors are much more reliable. With an additional dongle, it enables you to adjust the trigger sensitivity with military precision. Transform your AEG with V3 gearbox into a computerized training weapon system and gain a unique tactical advantage thanks to extremely fast trigger response - up to 6 milliseconds! Give your AEG a new lease of life!


ASTER is not just another drop-in MOSFET. It is a part of GATE ecosystem, turning your stock, low- and mid-tuned AEG into an advanced training weapon.



What makes ASTER so special?

  • Protection against battery reverse polarity
  • Proximity trigger sensor with up to 315 possible sensitivity settings
  • Configuration of main settings via trigger
  • Configuration of all settings via Bluetooth® dongle Blu-Link and GCS App for Android and iOS devices
  • Configuration of all settings via USB-Link and GCS App for Android, Windows and macOS devices
  • Built-in RGB LED for easier programming
  • No modification of gearbox shell needed
  • It has innovative optical sensors instead of mechanical switches, which can be prone to faults
  • Optical gear cam sensor supporting all types of gears such as: Infinite Torque-up, DSG, SSG, 19-tooth and standard
  • Binary trigger function as a basic function
  • Premium level functionality at an affordable price


Unleash the full potential of your AEG by replacing the trigger contacts with advanced Electronic Trigger Unit and control all settings wherever you are.


aster v3 2

GATE Control Station™ App

  • Connect your ASTER with GCS App via Blu-Link or USB-Link and get a total control of your AEG.
  • Set trigger sensitivity exactly as you like
  • Use pre-cocking to gain a trigger reaction similar to a real gun
  • Try out ROF control, magazine simulation and dozens of other functions
  • Update and upgrade firmware
  • See the BB counters and statistics
  • Perform diagnostics and send reports

Download GATE Control Station for your device


aster v3 3

Optical sensors

ASTER V3 is equipped with well-known and tested optical trigger sensor, the same as in TITAN V3, optical sensors detecting gear cam and selector positions. With the GCS App, you can easily calibrate, test and adjust all sensors.


Selector switching point adjustment

The selector sensor gives you an option for fine calibration of selector switching point.

Trigger sensitivity adjustment

The trigger sensor offers you even 315 possible sensitivity settings. You do not have to disassemble your replica. Just use GCS App to adjust the trigger to your preferences and level of skills. You can even activate 2-stage trigger and set two different trigger sensitivities. Pulling the trigger slightly produces Semi or Burst fire and pulling the trigger further produces Burst, Burst / Auto or Auto fire. Additionally, by upgrading firmware to ADVANCED or EXPERT version, you can even use equalizer mode. Thanks to this option, you don't need to fully release the trigger to fire the next shot. This option is really useful when the trigger sensitivity level is very high. The gen. 2 proximity trigger sensor offers the following sensitivity ranges, depending on trigger construction:


In total: 103–315 levels


In the first millimeter of trigger movement: 1–38 levels

Please note:

  • Trigger sensitivity and selector switching point cannot be set while programming via trigger.
  • USB-Link and Blu-Link are not included in basic ASTER sets
  • To upgrade your ETU, please go to our store and choose between ADVANCED (for 34,9 €) or EXPERT (49,9 €) firmware.



ASTER gives you the option to adjust:

fire selector modes


Two selector sensors allow you to take advantage of up to 343 fire selector modes variations, depending on the device firmware edition. The following modes are avaialble for selection*:

Safe – it prevents your gun from firing, even if safety lever is removed

Semi – allows you to fire one shot per one trigger pull

Binary – allows for firing one shot on the trigger pull and another shot upon release 

Burst – enables you to shoot a pre-determined number of BBs, which is very useful in MILSIMs and when using low-caps. There are 2 Burst modes available: 

  • Full – burst is shot in full, even if the trigger is released early
  • Interruptible – burst can be interrupted by releasing the trigger early

Burst / Auto – available for Full burst mode only; it allows for extending a burst by any number of shots – if you hold the trigger after the burst is shot, it switches to Auto mode 

Auto – shots are fired as long as the trigger is pulled

Semi Ramping – if you pull the trigger very fast, it switches to Auto mode

*You can check fire selector configuration possibilites provided by particular firmware editions here.

Please note: In case of Regional lock, only Semi mode is available. Check the law in your country.

 pre cocking

PRE-COCKING (gen. 1.5)

Victory in the game is often a matter of fractions of seconds. Thanks to Pre-cocking, you gain trigger reaction similar to a real gun. It allows for initial spring compression, which significantly speeds up the trigger response. The spring is automatically compressed after each shot. 

Manual mode – it allows you to set pre-cocking boost time between 1–250 ms with 1 ms precision and provides automatic voltage drop compensation. Pre-cocking is fully operational regardless of fire selector mode.

Please note: Using Pre-cocking increases wear and tear on the gearbox.



This feature allows for simulating magazines of lower capacity than actually used. Even if you have a high capacity magazine, this function lets you truly increase realism of your game by imitating that your magazine is real-cap. Then, after pre-determined number of BBs is shot, you will have to wait for previously defined amount of time before a next shot can be fired, as if you were really replacing empty magazine with a full one. In case of ADVANCED and EXPERT firmware, you can also set Low ammo warning

series safety limit


An AEG can continuously fire a predefined number of BBs in a single series. This can be used as protection against trigger jam. Important notice: In case of an emergency, you can always stop firing by switching the fire selector position.

sniper delay


It lets you set delay between shots or series to simulate the delay from reload or recoil. You can set 0.2 s0.5 s,1 s,2 s or 3 s delay for ADVANCED firmware and 0.01–5 s for EXPERT firmware.

rof control


ROF control enables reduction of a gun's rate of fire. You can use stronger batteries and still have a ROF exactly as you like. Depending on firmware edition, you can choose between Adaptive, Manual PWM, Manual Delay, Manual Delay + PWM.

Adaptive - set your desired rate of fire. Brake and delay will be automatically adjusted to achieve this value.

Manual PWM - set braking power in percentages between shots.

Manual Delay - set exact delay between shots in milliseconds.

Manual Delay + PWM - set braking power and delay manually.

smart trigger


We know how vital the fast trigger response is during combat. This is why we have developed the Smart Trigger function. It enables you to achieve faster trigger response. It works with the ROF Control System. During the first shot, the microprocessor sets the ROF control to 100%. After the first shot, it switches to a previously programmed value (e.g. 50%). As a consequence, the first shot is fired at a full ROF, and subsequent shots at a reduced ROF. The best results can be achieved when using a battery with voltage higher than standard. For example, if you use a 7.4 V battery, you can replace it with 11.1 V. In this way, you will achieve faster trigger response with the same rate of fire than with a standard battery. 

Works only if ROF is decreased by using Power settings of ROF control.

battery protection


Protection against over-discharge of the battery. Modern LiPo and LiFe batteries are very sensitive to over-discharge. If you do not want to damage the battery and you care about its service life, this protection is indispensable. The microprocessor monitors the battery voltage constantly. When the voltage drops down to a critical level, it will not allow firing. The number of battery cells can be detected automatically.

low battery warning


When the battery voltage drops to a predefined level, the motor will vibrate at regular intervals. A user is warned 5 times before the battery is discharged. Each warning is communicated by 3 vibrations: HIGH → MID → HIGH. 

adaptive active brake


Adjust the motor’s braking power according to your needs. Choose breaking value manually or set the adaptive active brake. It will stop the piston in the front position which eliminates unnecessary stresses, increasing the service life of the gearbox and its parts.

Adaptive active brake - Automatically adjusts the motor’s braking power according to the setup of your replica. Prolongs the lifespan of the motor and reduces the heat by adjusting the motor’s braking power.

Manual active brake - Choose your own value of active brake depending on your needs.



It enables a dynamic trigger point, which allows you to shoot even faster. Available in ADVANCED and EXPERT firmware editions.

Off – to fire a next shot, you need to release the trigger until it reaches the selected trigger sensitivity level

• 2LVL – to fire a next shot, it is enough to release the trigger by ~40% of trigger movement
• 1LVL – to fire a next shot, it is enough to release the trigger by ~20% of trigger movement

cycle detetion


Thanks to the gear cam sensor, drop-in unit precisely detects in which position the cycle should finish. Therefore, even the shortest trigger action produces at least one full cycle. The sensor detects the gear cam instead of teeth, so it is possible to use all types of gears: Infinite Torque-up, DSG, SSG, 19-tooth and standard. 

Thanks to the cycle detection function you get:

  • Automatic Burst – there is no need to manually set the burst time. You can simply set the number of rounds shot in a burst (available options depend on the firmware edition).
  • Full cycle – when pre-cocking is off, the drop-in unit ensures that the gearbox completes a full cycle. This way you gain higher reliability.
notifications settings


You can enable or disable information and warning vibrations, and make your gun stealth.

user profiles


Allows to access and switch between 3 different profiles customized for different preferences on the battlefield. Available in EXPERT firmware.

Other amazing ASTER features include:



This feature allows you to troubleshoot your AEG in case of any issue. Errors are communicated once they occur, and their description can be found in the GCS App.

firmware update


GCS allows for making firmware updates via the internet, which enables you to quickly apply changes, improvements and bug fixes. 

smart fuse

SMART FUSE (gen. 2)

Smart fuse protects your AEG’s battery, motor and the controller, even in case of reverse battery connection. A combination of current, voltage and temperature measurements makes your AEG installation highly reliable. It protects the MOSFET against overheating, overloading and short-circuiting. If your airsoft gun becomes jammed, this function protects the motor and battery against damage. To reset the fuse, you just need to release the trigger.



Do you want to achieve a higher ROF and faster trigger response? Are you planning a power upgrade of your gun? In that case, you need a MOSFET.

It targets the energy from the battery directly to the motor, bypassing the mechanical trigger contacts. As a result, you gain a higher ROF of the gun and a faster trigger response.

built in self test


This allows you to quickly check whether the drop-in module is working properly. It helps to locate where the problem lies when anything goes wrong.



Thanks to its special conformal coating, our product is resistant to atmospheric conditions (Military Specification MIL-V-173C).

printed quickstart


Make your adventure start more easily with a new product. The quickstart contains basic information and hints.





Control options

  GCS PC / macOS 3.0 GCS PC / macOS 2.x GCS Android GCS iOS
TITAN with GBU firmware + - + +
TITAN without GBU firmware - + + -
ASTER + - + +
TPC + + + -
USB-Link + + + -
Blu-Link - - + +

Please note: to connect ETU to GCS you need USB-Link or Blu-Link


  Blu-Link with GCS App USB-Link with GCS App Programming via Trigger Tactical Programming Card
Compatibility with ETU with GBU update + + + +
Basic settings adjustment + + + +
Advanced settings adjustment + + - -
Firmware update + + - -
Portable + + + +
Sensors check + + - +
Diagnostic Trouble Codes + + + +
Statistics + + - -
Updates and support + + + -

*Please note:

  • ASTER V3 is not compatible with replicas equipped with Arcturus gearboxes.
  • ASTER V3 is not fully compatible with Tokyo Marui NGRS gearboxes.
  • In G36 replicas, ASTER LED lights are not visible due to body design. Programming and adjusting the settings can be done by following vibrations or by connecting with GCS App.


GATE does not guarantee the compatibility of mosfets and ETUs such as TITAN or ASTER with brushless motors. Connection of a brushless motor can cause immediate damage to the device, motor and battery, that is not covered by the warranty and can lead to a fire.


Programming via trigger

Thanks to our built-in technology, you choose how to configure ASTER. Do you need a quick change in settings on the battlefield? You can do it via trigger. If you prefer full control and visual interface, connect your replica via USB-Link or Blu-Link dongles with our GCS App. To enjoy full potential of ASTER, you can upgrade its firmware to ADVANCED or EXPERT version.


This programming mode allows you to configure basic functions of ASTER only with trigger and fire selector. During programming, functions and options are indicated by corresponding LED colors and vibrations.

AR & G36


ast23 programming via trigger card AR+G36 201211 0656 1


ast23 programming via trigger card AR+G36 201211 0656 2


ast3 programming via trigger card AK 201211 0656 1 ast3 programming via trigger card AK 201211 0656 2

Programming accessories


Blu-Link allows for wireless management of your GATE ETU via GCS App for iOS and Android devices. Blu-Link perfectly expands GATE ETUs possibilities by equipping them with Bluetooth® 5.0 technology.



The USB-Link allows to connect and manage GATE ETUs with GCS App for Windows, macOS and Android devices.



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  • ASTER Module with BASIC firmware edition
  • ASTER Patch
  • 2 x 'Programming via Trigger' Card
  • Installation Kit
  • Quickstart Guide

Please note: In order to configure ASTER via GCS App, you need the USB-Link or Blu-Link, which is not included in the kit. 


Blu-Link [BLU-L]

Blu-Link allows for wireless management of your GATE ETU via GCS App for iOS, Android devices. You can use iPhone, Android smartphone to control ASTER or TITAN and connect them with other compatible GATE devices, such as STATUS Gun-mounted Computer. Blu-Link perfectly expands GATE ETUs possibilities by equipping them with Bluetooth® 5.0 technology.

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Kit contents:

  1. Blu-Link
  2. Connectors set
  3. ‘Troubleshooting’ Card
  4. PIN Card
  5. Quickstart Guide



USB-Link for GATE Control Station™ App [USB-L2]

Allows connecting ASTER to PC/Mac as well as smartphone with Android in order to use the GATE Control Station App.


  1. USB-Link for GCS App
  2. USB-C cable [0.6 m / 1 ft 11 in]
  3. Micro-USB cable [0.6 m / 1 ft 11 in]
  4. 'Troubleshooting' Card
  5. Quickstart Guide


USB-Link for GATE Control Station™ App [USB-L]

Allows connecting ASTER to PC/Mac as well as smartphone with Android in order to use the GATE Control Station App.


  1. USB-Link for GCS App
  2. USB-A to Micro-USB cable [1.5 m / 4 ft 11 in]
  3. Quickstart Guide


Firmware editions

Take the next step and gain additional functions with ADVANCED and EXPERT upgrades. Enjoy access to main ETU statistics and measurements, precise ROF control, all fire modes such as customizable burst, semi ramping, burst/auto on one mode, equalizer, sniper delay and many other extremely useful functions - everything to prepare for the most demanding mission.


ASTER is available in 3 firmware editions: BASIC, ADVANCED and EXPERT.

  • BASIC: The best for those who prefer simplicity but require the highest quality. Economic version with limited number of functions. If you decide to have more functions, there is always an option to upgrade firmware from BASIC to ADVANCED or EXPERT.
  • ADVANCED: The best for those who like complex solutions. Advanced version with wide variety of functions. It enables access to the Statistics and ASTER World Rankings.
  • EXPERT: The best for experienced airsofters. Vast diversity of settings and options combined with maximum configuration capabilities allow you to prepare for the most demanding mission

The table below contains a functional comparison of settings configured via trigger and across firmware editions. The comparison applies to ASTER possibilities and TITAN functionality after GBU firmware update. You need to purchase USB-Link or Blu-Link to connect ASTER with GATE Control Station.

Edition comparison

Download edition comparison in PDF

In order to upgrade your ASTER, you need to purchase the upgrade:
Upgrade page



  • Support for stock and mid-tuned AEGs (high-tuned AEGs are supported in case of EXPERT firmware edition)
  • Maximum operating voltage: 12.75 V (LiPO 11.1 V)
  • Minimum operating voltage: 3 V
  • Absolute maximum voltage: 17 V
  • Conformal coating (Military Specification MIL-V-173C) – resistance to atmospheric conditions