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Airsoft Systems ASCU Fire Control System for Ver 2 AEG Gearbox - Gen 4

ID: 42081 (Burst-ASCU-V2G4)
3.6 stars, based on 14 reviews
Airsoft Systems ASCU Fire Control System for Ver 2 AEG Gearbox - Gen 4
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$99.95 $79.00

MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.


  • Ultra fast trigger response
  • Optional Bolt-Stop simulation
  • New MosFet transistors with 16 times less resistance, resulting in to faster cycle, better active brake, more shots per battery charge and less heat
  • Simple drop-in installation
  • No soldering required
  • Improves gearbox reliability
  • Updated software with easier programming (accidental hop-up program activation is impossible).
  • Improved selector plate
  • Fits all standard and reinforced version 2 gearboxes
  • Better short-circuit protection
  • 3 year world wide warranty offered from Airsoft Systems
  • Compatible with LiPo, LiFe, NiMH, and NiCd batteries from 7.2V to 12V

Package includes: FCU, Selector plate, Cut-off lever
Compatibility: For most standard Version 2 AEG Gearbox

Manufacturer: Airsoft Systems

About ASG

ActionSportGames is a worldwide leader in the business of replica firearms and accessories manufacturing – including Airsoft guns, Airguns, CO2 guns and firearms replicas. We specialize in 1:1 scale replica guns and accessories for fun, action, sports, entertainment and collection. Today were proud to be recognized as the innovator and manufacturer of the CZ EVO3 A1 AEG and having introduced several Airsoft versions of this popular Airsoft gun to the market.One of our goals is to become the preferred supplier in the firearms replica business through worldwide license agreements, quality brands and premium service – before, during and after sales.

14 Customer Reviews

(Write a review)

by Lisa Q. on 04/15/2017
"I bought a custom gun off of Ebay with this installed by a likely extremely experienced tech, because this thing worked flawlessly. It has fantastic trigger response, not the best, but it should keep up with any fast trigger pulls in the field. Also, I don't know if it helps, but I'm pretty sure a small FET was installed in my stock as well, after a change to a deans connector. Never over/undercycles when battery is full, great control there. I used about 9.6 lipos with this, worked great. Also the damage protection shutoff when battery is really low/out works fine. I don't understand people's issues with this thing, but if you know what you're doing, buy this. Otherwise if you don't, I guess just buy a GATE Titan or BTC Spectre, of which I'm actually ordering a GATE Titan for my other personal custom m4.
by Andrew F. on 05/26/2016
"This thing is a piece of trash, I have gone through 3 of these things and all of them have either burnt out or had a system failure.

The first one I received, I installed perfectly. I had to sand down my gearbox a little but other than that it fix fine. But then I plug in my battery and it fired once and a tiny piece broke off.

The second I had my friend install who is a pretty good tech. He even upgraded the gearbox, new shims, shs gears, new piston, nothing in my gun was stock. I go outside to shoot it because it was good to go, and I went through about 375 rounds then it had a melt down and started shooting full auto.

The third and final one I stupidly purchased was installed by my other friend who is a mediocre tech, got it in, didn't even shoot. It just started to smoke, I was using a 9.6v battery, HOW DOES THAT EVEN HAPPEN M8. THIS THING IS DESIGNED TO TAKE 11.1 LIPOS AND IT SHORTS OUT ON A 9.6.

Never, ever, ever, ever, EVER buy this thing. It is a waste of good money. Buy a g&g ETU or the one made by ameoba because if they break it's only 50 bucks you spent and not a 100 wasted. Maybe if you have the money, just buy a BTC cuz they good as hell man. My friend has one and it is SOOOOOO sick with the ASG 28 tpa motor. Definitely buy that it is worth every penny, and not the ASCU.
by Justin R. on 05/09/2016
"After having a terrible experience with Gen1 and Gen2, I figured I would give this new Gen4 a try.

I just got it in the mail today. The installation was not great. The fit was VERY tight. After a little sanding on the large plastic cover, I got it to fit snug. I wired it all up being careful not to strip or pinch anything, plugged a 7.4 in and it fired fine three times. Then I could smell smoke and it started firing on auto by itself.

I took it out and observed that one of the mosfet had burned. Save yourself the $100 and find something else.

This is probably the worst airsoft investment I've ever had.

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