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Perun Upgrade MOSFET Kit for G&G ETU AEG Gearboxes

ID: 94619 (Mosfet-Perun-GG-ETU)
G&G ETU Upgrade kit
Perun859188946194G&G ETU Upgrade kit94619
5.0 stars, based on 3 reviews
Perun Upgrade MOSFET Kit for G&G ETU AEG Gearboxes
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This item is currently Sold Out


  • Ultra compact mosfet designed for G&G ETU gearboxes
  • Specialized transistor w/ very low resistance
  • Cycle control and programmable firing modes
  • Active brake and precocking
  • LiPo protection; can be used with LiPo batteries up to 14.8v
  • Ultra-low resistance wiring
Perun Upgrade Kit for G&G ETU enhances your trigger unit by adding several new options. Simply disconnect the stock electronic board and plug in our Upgrade Kit. The stock trigger unit is retained, so there is no need to open the gearbox.

Possibility to set any combination of the following firing modes under "SEMI" and "AUTO" selector positions independently:
- safe
- semi-automatic
- 2 to 5 round burst
- full-automatic
Programming of all of the settings, not only firing modes but also switching active brake, precocking and battery protection on and off is done solely by using easily memorable sequences of fire selector switching and trigger pulls. That allows changing the settings at any moment in a matter of seconds, even under enemy fire.

Fast trigger response can be a matter of victory or defeat, especially in CQB situations. With precocking enabled, piston will remain in rear position after each shot with spring already compressed, ensuring that next shot will be fired immediately after you pull the trigger. Precocking works in semi, burst and full-automatic modes.

Battery protection mode, dedicated to Li-Po batteries. Should the battery voltage fall to a dangerously low level, user will be notified by short sound signals that are repeated every 30 seconds. This may also be freely switched on and off.

Double shot mode allows for easy double shots in semi-automatic setting. After enabling this mode, if semi-automatic fire is set, shots will be fired not only when the trigger is pressed, but also when it's released. Upgrade kit works without problems with any battery from 7V do 17V. Even if the battery has only enough power to make the replica fire at a very low rate of fire, the circuit will work. It can also be used with most extreme setups, without any limitations as to the spring rating. The maximum rate of fire is 50 RPS.

Electronic fuse designed to work with Li-Po batteries will save your replica and battery in case of a major malfunction. It will automatically disconnect the battery, if a short circuit or blocked motor is detected.

G&G ETU has an active brake, which is retained in our upgrade kit. Active brake allows to stop the motor after each shot. In case of double shot problem in replicas with high rate of fire, active brake will be an effective solution. It can also prevent compression of the main spring for a longer time, if you will fire a shot with AB on before a storing your replica for a longer time. Active brake is can be switched on or off at any time in few seconds.

Manufacturer: Perun Airsoft


Permissible Battery Voltage: 7V-14.8V
Max FPS: 650 FPS (using .20g BB's)
Max Rate of Fire: 50 RPS

About Perun

Perun was established in 2016 with the aim of designing and manufacturing MOSFET devices and other parts for AEGs. After years of designing and testing, we offer you products that will work reliably even in most extreme situations and enhance the capabilities of your replicas.All of our design work and most of the manufacturing is done in the European Union state of Poland. That allows us to reach our main goal - keep the highest quality possible. We are in constant contact with players, airsoft techs, shops and consult with them to ensure that our products satisfy their needs.

3 Customer Reviews

(Write a review)

by Michael Z. on 06/17/2020
"So i bought my son a G&G PCC-9 because he likes small smgs like the Evo ...but this was a LOT less expensive. Yes...i could have got him the ARP-9 but the PCC-9 has a big stock and we could use our 11.1 Li-Ion batteries in it. We have killed so many LiPos over the last year that i had to switch over to Li-Ions so i wouldn't go broke on batteries. They are super forgiving and you can drain them down to nothing. One battery can last all weekend without changing too.

The big reason he liked the ASG Evo was because it had a three round burst selector. This mosfet claimed to be able to give us that in the G&G easily....and still be less expensive than buying the Evo.

The unit really only took like 20 minutes to install. Just needed to unscrew the buffer tube and then get that damn screw back in again after plugging three plugs into the existing wiring. No soldering or opening of the gearbox required.

Programming was really simple. Just flip the fire selector on the gun back and forth two times and you are programming that setting (semi-auto or full auto position) I went through every option and we found that we liked the binary trigger setting where you get a shot when you pull the trigger and one when you release it in the semi-auto position. It's almost like full auto. We noticed a lot of overspin when you spam the trigger in this setting so I enabled active breaking. That took like 15 seconds. and stopped the overspin immediately. We then set the full auto setting to be a 5-round burst. Very fun! He was happy.....and that's really all i cared about. It has a pre-cocking function that i tried but really didn't notice that much difference in his gun with it enabled. I also read that you need to turn it off after every outing so you don't compress the spring i didn't really make sense for me to leave it on.

We played in a 2-day event last weekend and had a lot of fun. The gun worked perfectly. Easy and cheap upgrade for newer G&G guns that already have a fire control unit in the buffer tube. Now i just need to get the upgraded springs for the Action Army 120 round mid-cap Mags that fit in this style of G&G gun so we can feed .28g+ bbs. Those mags without the upgraded springs can't push anything but .25s or lower.

I would buy this again.
by Armin A. on 04/29/2020
"Objectively improves any G&G gun with the etu. Basically a fully featured gate warfet with a 30 second installation. Super worth it
by Brian W. on 01/15/2020
"This thing is great!! I have done quite a few upgrades to my G&G SRS and I gotta say, this is probably the best bang for the buck! I absolutely love the precocking on this, as well as the other things you can change on the fly and without any kind of plug in or software.

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