ASCU2 for V.2 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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ASCU2 for V.2 gearbox
Manufacturer: Airsoft Systems
Product code: ASS-08-013969
Rating5/54.89 / 5 (9 reviews)
Out of stock.
Ready to ship in days
Cost from £11.18
81.08£ / 1pcs
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     ASCU2 for V.2 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.

In the case of the new module, its functions and characteristics are very similar to the previous model, yet the new ASCU module is hidden completely in the gearbox. What is followed by this, you do not need any additional wiring or extra place in the replica. As the manufacturer informs, the new unit is equipped with updated and newer software, an active break and it reacts better for the trigger operation. Additionally, the new ASCU V.2 set includes a dedicated firing mode selector plate, a cut off plate and a thermal-conducting tape.

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
- a dedicated H-U chamber makes it impossible to shoot when the magazine is empty
- 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.2 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.2 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.2 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.


Attention!!! The ASCU is not compatible with the ICS’s V.2 gearbox.


Details available here:

Tech specs:
Users reviews
Number of reviews: 9 Average rating: 4.89
Rate: Rate: 5
Author: Henry, Kalundborg
Easy to install, instructions Are easy to follow. And you get a good fire control. Airsoft systems provide good support if needed.
Rate: Rate: 5
Author: Telmo, Foz-Do-Sousa (Gondomar)
Forget PTW, just perfect system for any ver.II AEG, trigger response amazing ;) 10* ASCU 3 Ver.II
Rate: Rate: 5
Author: Dragos, BUcuresti
Fit nicely for front wire M4. Wires a little stiff. On 7.4v Li-po is firing only 2 rounds burst only. Gearbox needed a little dremeling nothing seriuos but I preferred to adjust it rather than the sand the ASCU. Easy install for tye 1st time.
Rate: Rate: 5
Author: Declan, Co. Roscommon
I have previously owned the gen 2 ascu mosfet, and in comparison the design is many times better. The gearbox is used as a heatsink and they have also included a dedicated selector plate so there is less work involved in the installation. The mosfet wires can go to the front or stock without modification, but be careful when bending the wires. Semi with this unit in comparison to without a mosfet is perfect, every time you pull the trigger it will fire, and it's even possible to achieve full auto if you can pull the trigger fast enough. It's an essential unit for a gearbox, definitely worth the money.
Rate: Rate: 5
Author: Ofir, Bucharest / Bucuresti
good upgrade for you gun ! recommend as a basic upgrade, must get it !
Rate: Rate: 5
Author: Mario, Setúbal
After burning two trigger contacts on my high speed build using 7,4 li-po, I decided to get the ASCU. Couldn't be happier. Great trigger response and I love the 3-round burst integrated on the full auto. Had to modify it to front wire and file down a bit from the selector plate, because it was touching both contacts and shooting full auto on single, but I was expecting already some modding before the buy. Nothing too hard. But I don't advice front wiring for inexperience ppl. Once again, VERY PLEASED.
Rate: Rate: 4
Author: Frederik, Virum
ASCU2 for V.2 gearbox

Installed it a week ago and after firing a couple of mags (about 400 bbs) I must say that I'm impressed by the system.

I have it installed in my G&P m4 and the gearbox was not very compatible with device, it would probably be easy to fix if you have a file (electric is good) and some knowledge about what's safe to remove, but it took almost 4 hours to make it 'fit' (gearbox is closeable).
But the performance is worth it.
-The trigger pull is much better because you know exactly when the gun will cycle.
-The gun (motor, gears, piston) doesn't spin after the shot is fired. It stops immediately, eliminating unintentional bursts and any unpleasant sounds from the gears.
-No trigger jamming when using semi. (!)

I've not noticed any change in rate of fire or first shot speed.

I'm using it with m160 copy motor and a fairly powerful spring, one tooth removed so it's going just below 130 m/s
Powered by 11.1 v 1200 mah lipo battery in the stock tube. 4/5 stars mostly because of the installation and lack of experience (with the system) so far. Picture: Green: pinholes for the upper part connections. Yellow: cut off lever. Red: parts that conflicted with the board (either upper or lower) and needed sanding.

Rate: Rate: 5
Author: Paulo, Maia
The best thing to put in your AEG... no need for a PTW... eheheh... and it's cheaper!!!!
Rate: Rate: 5
Author: David, La Ravoire
This mosfet change the performance of your AEG! This is great! The installation is very simple. WARNING! Be careful not to pinch electrical cables
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