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Airsoft Systems ASCU Gen4 for Ver.2 gearboxes

Airsoft Systems ASCU Gen4 for Ver.2 gearboxes
Product Description

The ASCU Gen.4 (Airsoft Smart Control Unit) is a electronic module, that makes every standard AEG with Marui type Ver. 2 gearbox, work exactly as the most expensive and sophisticated Airsoft rifles known as Professional Training Weapons.

The new 4th generation unit has been updated with new software and hardware for increased reliability, durability, and ease of install. It has a 4 selectable fire modes, like 3-round burst, if the trigger is released before the third shoot in Full-Auto mode, if the trigger remains pressed the AEG will continue to fire until trigger is released.

The ASCU Gen.4 system monitors the operation of the AEG in any time, and no matter how fast you tap the trigger, the AEG will always complete the full cycle, no matter if you shoot in Semi or Full Auto mode. After each shot or burst the piston will stop in its foremost position.
It features an integrated Low Drain Protection, specially designed to keep LiPo batteries from damage.
When using the ASHU (ref. 17535) it will detect when the magazine is empty and stop the AEG from shooting preventing dry firing.
The ASCU Gen.4 will also stop the AEG firing if any mechanical problem occurs in the AEG, which protects the internals of the gearbox from further damage.
The unit is easy to install in all AEG's with Ver. 2 gearbox, but should be installed by a skilled technician. 
This is the generation 4 version with upgraded software and hardware.


  • Empty magazine detection with ASHU.
  • Always completes full cycle of the gearbox.
  • No gearbox jams.
  • Crisp and realistic trigger feel.
  • Reduced realistic trigger travel.
  • Faster trigger response.
  • Increased rate of fire.
  • Increased battery life.
  • Increased main spring life.
  • 4 selectable firing modes.
  • Compatible with all kind of batteries, gears and springs.
  • Battery deep drain protection integrated.
  • Safe for LiPo batteries with automatic power cutoff.

The Generation 4 ASCU features the following updates:

  • New MOSFET transistors with 16 times less resistance, resulting in to faster cycle, better active brake, more shots per battery charge and less heat.
  • New very strong trigger switch.
  • New reinforced design with full polymer encasing.
  • Better short-circuit protection.
  • Easier installation.
  • Updated software with easier programming (accidental hop-up program activation is impossible).
  • Improved cut-off lever.
  • Improved selector plate.
  • Fits all standard and reinforced version 2 gearboxes.
  • 3 year world wide warranty.

Important: The ASCU works properly only with motors with strong magnets, With cheap and weak magnet motors the active brake will not be effective. We recommend using ULTIMATE motors, the most sophisticated motor in the industry.

We strongly recommend that the ASCU should be installed by an experienced Airsoft service.

Airsoft Systems ASCU Gen4 for Ver.2 gearboxes (1)


Good but not worth the money when compared to BTC's mosfets. The mosfet also does not have as many features and cannot be customised as much as the spectre or chimera. However this mosfet is still a good upgrade for the not-so-tech-savy people who want a simple, reliable and effective solution.

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Will this fit on my G&P Sentry and

Would I need to replace the stock motor ?

Yes it will fit any Version II gearbox except for ICS models. And you won't need to replace your motor.

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