JeffTron Leviathan Airsoft Drop-In Programmable MOSFET Module (Type: V2 Optical / Wired to Stock)

"Excellent mosfet. Direct drop in, great options and features. I liked the ease of install and performance so much that I bought a second one to put in my other cyma ak I was originally planning on converting to HPA. 10/10

"My first experience with any kind of optical MOSFET

Very familiar with the internals of a gearbox and have been teching for years installing various in-line Mosfets from gate.

That being said I'm extremely happy with the Leviathan!

Easy to install, no modifications required to the gearbox for krytac but you will lose the ability to hold the mock bolt back for hop up adjustment.

The Mosfet itself has an area very clearly defined which can be removed to fit in the Krytac shell. Once that area is trimmed it is absolutely drop-in

The first game I played with my LVOA was a night game and I fired around 2000 shots, towards the end of the night the trigger seemed to be rubbing on something mechanically. I had made it a hair trigger using the included trigger and set screw and it was just barely past the RFTS Metal clip which is there to simulate the feel of a real trigger

After disassembling the gearbox I noticed that the RFTS metal clip was slightly conflicting with the trigger itself. As I had no need for it anyways I carefully removed it from the circuit board. It has no electronics connected and pulling it out does no damage to the board

Used it again today and put another 3000 shots through the rifle with absolutely no problems whatsoever. I will be installing The same Mosfet in my krytac PDW but I will be removing the RFTS clip before installation.

The app is super easy to use and the Bluetooth feature is amazing! Definitely highly recommend especially if you're dropping this in a krytac

One note, I wasn't sure whether to take the metal band that contacts the stock trigger off of the selector plate. I looked online everywhere and could not find any information about it.

I personally removed the metal band from the selector plate before applying the sticker. Everything works as it should without the metal band in place.

"I LOVE this thing, it is totally worth the money and I would absolutely buy it if you get the chance.

Pros: TONS of adjustable features (all of which are accessed through the app.)
Very straight forward install.
If something isn't working the MOSFET will tell you through the app.

Cons: N/A

Just make sure you read the instructions, they will explain everything you need to know.

"Man this thing is great. The app is a little wonky but very solid overall. I haven't tried a Gate Titan to compare but this definitely feels like a top tier mofset with all the possible functionality one could require.

"This thing is awesome! I love how easy it is to adjust settings with my phone. The trigger response is amazing. The only thing that I wish was different is that you could make it a hair trigger, but the with the way the micro switch is set up is so that it can't have that short of a trigger pull. Nevertheless the trigger pull is still way shorter than your average trigger switch! I would highly recommend this MOSFET to anyone looking to upgrade! I will never go back to a regular trigger switch again!

"For the price, this is an amazing mosfet. After installing this into my gun the trigger response went from an extremely whiny slow m4, to basically what feels like a dsg. When paired with 13:1 gears and a high torque motor, this thing is a beast. With the small set screw that is included with the trigger it is easy to make the trigger pull next to nothing. And with the precocking turned on the trigger feels amazingly snappy. The bluetooth is also a nice and easy feature.
My only complaint (and it is my fault) is that my semi microswitch broke. I forgot that you have to file down he edges of your selector plate to prevent this. So I only have a full auto. But with the bluetooth I can program it to do semi to comply with field rules.

"this mosfet is really awesome. easy to install, and very well made. the app control is the coolest feature, along with the adjustable trigger travel (if you get the included trigger which i highly recommend). I'm using it in a custom high speed APS/EMG/F1 m4, and it has barely any trigger travel. when combined with the pre cocking, and high speed setup of my gearbox, it is the ultimate anti-cheat gun. recommend over the gate titan, especially if you're on a budget.

"This mosfet is great!

its really easy to adjust to what ever setup you have it on. i used it on my custom mp5 for a wile, although i recently moved it to my Echo 1 Scar 16.

what i will say is in moving it one of the micro switches for the selector plate broke. not a problem for me as I'm building it to be an AEG sniper so most fields will require semi auto anyway, but a good note/suggestion would be to not swap the selector plate on the gear box it is on; as those micro switches are a bit fragile. I'll more than likely buy another some point in the near future for other guns as I go through and upgrade all of them

"Amazing Mosfet, I love the Bluetooth and the app. It's so easy to just tune your gun while on the field. However, I had a little trouble with the microswitches, but Leviathans customer service was supper responsive and helped me out. Amazing mosfet and amazing company.

"great product, I put it in my G&G Arp9 and so far haven't hap any problems. One thing that is annoying though is that the wires, when they're put into place, lift the side up that is next to the cylinder, so that just makes one more thing to have to juggle around when putting the gearbox together. all around though, very durable, great rps if thats what your looking for as well.

"Easy to install and easy to program from the app (which by the way now is available for iPhone users too, previously only android). Counts your shots, lets you control what your selector switch positions do (ie, semi/burst, full auto, burst/full). I rotate between DMR and rifleman for open play and this makes it easy to lock semi per my fields rules.

I had an issue using 9.6v batteries where the gun would stop cycling, almost like it was jamming, but switching to 7.4v lithium resolves this instantly. 5,000 rounds since the switch no issues.

"Purchased the leviathan v2 wired to stock version for my G&G CQB m4, was an easy installation, but of course I had to file some areas down to not affect wiring but nothing to affect the performance of the rifle itself, this is an amazing product. Being able to fully customize the trigger setting as well as the pre cocking and braking with binary trigger options and all that other good stuff, I suggest buying Teflon for the trigger screw itself because it tends to come loose, other than the minor adjustments I had to make I do not regret this purchase one bit and recommend to anyone trying to build a polar star destroyer

"Let me start off by saying I've owned two leviathans and had amazing luck with the one I had preinstalled by maple arms with my blackout and have been running it for over a year and a half with zero issues as for my other one I had a local tech install and have had nothing but issues with it since and he actually ended up causing damage to the mosfet jefftron took it free of charge and fixed it all no questions asked even though it was a user error that's a huge plus for me right there! Their customer service is amazing and the help group on Facebook can get you through almost any issues you might have with it! I'm a customer for life!

"I got this to drop in my VFC Scar- L. The trigger response is instant with the pre-cock setting. I paired it with the SHS 12:1 gears SHS blue piston,Modify ar latch, ASG 28 tpa motor, Laylax M120 spring and Lonex M16 full cylinder kit. The results have been astounding!!

Pros:
Plug in play mosfet
Pre-cock and active brake
Bluetooth programming
2 year warranty
Trigger squeeze

Cons:
Motor connectors tend to be very brittle.
Gearbox and even gun(scar in my case) may require some modification to fit.
Bluetooth app can be a bit of a pain at times.

In conclusion this product is well worth the money and a must have for any build requiring a fast trigger response with out going hpa.

"One of the best on the market. I would highly recommend either taking your time to install if you are a techy sort of person, or having a professional do it.

If installed correctly the Jefftron Leviathan V2 is an incredible piece of technology. I have installed 3 of them, and 2 out of the 3 went absolutely perfect. The one that didn’t go as well was partly do to user error and gearbox fitment. After heavy use, though, the motor connects fell off, and had to be re-soldered, which is why I recommend for more advanced users.

I love the Bluetooth controls, and the error log is invaluable. Everything is very seamless to adjust; any where from active motor braking, to rate of fire, to fire modes, etc. You can see your mosfet temp, your motor amperage, the works! It’s incredible.

Overall, best investment for the more avid airsofter.