ASCU3 for V.3 gearbox

  • The advanced replica management module responsible for expanding the lifespan of the inner parts as well as for improving the replica’s parameters. Minimized and improved version.
  • Weight: 30g
  • Manufacturer: Airsoft Systems

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ASCU3 for V.3 gearbox
Manufacturer: Airsoft Systems
Product code: ASS-08-005764
Rating5/54.60 / 5 (5 reviews)
Out of stock.
Ready to ship in days
Cost from 2,43 €
73,34 €
73.34 / 1pcs
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     ASCU3 for V.3 gearbox

The ASCU is a two-part electronic module ( the control module and the sensor module ) which, upon being installed in the Airsoft replicas, significantly improve their operation. The traditional joint module was replaced with a sensor module which monitors the actual position of the piston thread-wheel, the firing mode selector lever and the trigger. The gathered information is sent to the control module – in which the software located in the processor analyzes it and controls the replica’s motor with the use of the MOSFET active break.

ASCU Gen. 3+ includes the following upgrades: 

- added polymer padding to the circuit boards, protecting them from damage during installation
- obsolete short-circuit software removed, making shots in semi-auto much faster
- every pull on the trigger results in a single shot, new system prevents any double-shots
- new cut-off lever and selector plate designed specially for the ASCU
- new, thicker wires
- no need to dremel or modify the reinforced gearboxes.

The ASCU improves the operation of a V.3 gearbox and makes that the replica equals the more expensive replicas and the more sophisticated PTW class replicas. The ASCU system monitors the operation of the replica no matter the speed of squeezing the trigger and is responsible for the full cycle of the piston’s operation, both in the semi-automatic and full automatic firing modes. The piston stops in the starting position after each shot.

The ASCU is equipped with the Low Drain Protection system which is specially designed to secure the lithium-polymer (LiPo) batteries from being damaged.

In case of any emergency, the ASCU stops the firing mode in the replica and, therefore, secures the inner elements from further damage.

The ASCU is easy to install in the replica which is equipped in the V.3 gearbox. Most of the models does not require the modification of the airsoft rifle’s original parts. Yet, in some cases, some minor changes may have to be introduced – thanks to this the installation process will be completed without any problems.

The control unit  is very small and may be placed in the stock or in the front grip (6,5cm x 1,6cm x 1,4cm), while as the second sensor unit fully replaces the connection module and the wiring.

The sensor unit  monitors the operation of the piston thread-wheel and thanks to this the whole system is capable of making a full cycle of the gearbox operation (the BB pellet will never remain in the barrel upon removing the magazine and the main spring will always be lose when the replica is not used).

The ASCU module is adapted to operate with more sensors which will not allow to place a shot when the magazine is empty and, in the case of the “M” replica series, it will make the user use the magazine catch lever whenever the magazine is replaced with a new one.

  • The module improves the trigger’s reaction time of the AEG replica, which in comparison to the classic module is practically instant.
  • It prevents from an accidental double shot: when the next trigger squeeze is faster than the human reaction – each trigger squeeze is one shot.
  • It allows to shoot a 3 round burst by squeezing the trigger shortly in the full-auto firing mode.
  • The easy to install module replaces the connectors and the anti-reversal in any V.3 gearbox which’s application eliminates the jamming of the piston. Moreover, it guarantees that the replica will always make a complete cycle (the main spring will remain in the lose position).
  • The ASCU controls the battery charge level and does not allow it to discharge too excessively what is very important whenever using lithium batteries (LiPo, LiIon, LiFe).
  • The module scans for problems and malfunctions and informs about it with a sound and vibration and, also, cutting off the power source what prevents from further damage to the gearbox.
  • Cooperating with the dedicated HU chamber, the module eliminates a blank shot in the replicas equipped with an operating bolt catch – this means that it is impossible to shoot when the magazine does not feed the replica with BB pellets.
  • The ACSU unit significantly extends the battery’s lifespan.
  • It gives more possibilities than the Systema Revolution and the PTW at smaller installation costs and allows to use a wide range of spare parts which are available for the V.2 and V.3 gearbox.
  • The product is granted with a 24-month warranty; only in the case when it is installed by an authorized service.


The ASCU unit has got the CE certificate and is compatible with the RoHS directive.


Details available here:

Users reviews
Number of reviews: 5 Average rating: 4.60
Rate: Rate: 5
Author: Jonathan, Gelrode
I can recommend this, it's really nice. Had it installed in a CM045 by the people of gunfire and it was done professionally. It shoots like a dream. As with anything just read the manual it comes with.
Rate: Rate: 3
Author: Cyril, Saint Souplet

Nice product. but a hair trigger mod and a Merf 3.2 are as good and cheaper. I also regret that the electronic system is not isolated. attention to short circuits during installation instaled in a Jin Gong SL8 custom CQB

Rate: Rate: 5
Author: Boris, Sint-Martens-Latem
Change your V3 AEG into a PTW in less than an hour! Real quality product, robust and accurate. What more do you want from the trigger mech. Installed into a SIG556 wich is not really supported but works fine, only thing is with the thick wiring some sanding and filing is required but it's possible to fit it all. Safety works fine, selector plate nicely contacts with the little nub on the chip. One little downside is no custom tweaking abilities towards ROF. Overall you will never regret an AEG with 100% reliability.
Rate: Rate: 5
Author: Kenneth, Oosterzele
Quality product. ASCU V3 Gen3+ is easy to install and program. Installation guide is clear. I've installed it in a G&G RK104. For this airsoft gun, the standard wires are too thick, so I had to replace them. This is because the reciever of the G&G RK104 is thicker then TM style reciever. Installation in TM style reciever would work without changes to wires. Th ASCU works fine. You really need a quality high torque motor for it to work properly. Installation guide said there is no need to re-install safety on gearbox, but this doens't seem to be true. Without the safety part on the gearbox of an AK-type replica, it will still fire even when safety lever is on safe. I hope this unit will last a long time without problems.
Rate: Rate: 5
Author: Dia, CONSTANTA
I instal only V3+ FOR v2 and is ok.
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