JG / CYMA 8mm Reinforced Gearbox for M4 M16 Series Airsoft AEG with Mosfet - Rear Wired

$70.00 $59.50

Model: GB-M4-MOS8mm-B
Location: U11-109

8 Customer Reviews

by Neal R. on 06/02/2014
"Just got mine today it looks different from the picture and has a aps MOSFET (decent) but only thing I'm having problems with is getting the motor to fit into it I think the MOSFET wiring and soldering is getting in the way of the motor gear and I can't get the cap on to suck the motor up in there but everything else seems fine haven't got to shoot due to motor not being able to fit good or something I got the G&P 120 motor might have been worth to have just gotten a whole new pro kit receiver motor gearbox and all for 120
by Jorge F. on 05/26/2014
"This is an excellent gearbox so far; although when I received it, it did have a slight problem. It would fire on its own! I was thinking of RMAing it, but I decided I didn't want to wait, so I opened it up, and something corrected itself automatically. I replaced a few parts (piston with metal teeth, bore up piston head and cylinder head and air nozzle with o-ring) and now it works great.

Pre shimmed / lubed
Spring guide notches are big (very helpful when assembling)
Strong tappet plate
Reinforced gearbox shell
Bearings (not ball bearings)
Gearbox screws (phillips heads, :P)
Easy takedown
Shoots hard (I haven't chronoed though)
Works very smoothly

Irritating things:
Putting the mosfet in the buffer tube
Wiring is a bit long, but it works
When assembling, it is hard to keep the trigger in place
Motor wire connectors aren't bent (I had to bend them myself)

Plastic piston (has one metal tooth) - replaced with metal- toothed piston
Air nozzle (no o-ring) - replaced with an air nozzle with o-ring

I am thinking about getting another one of these gearboxes :D
by Brad B. on 10/08/2013
"Some of the below review seem outdated mentioning what seem to be JG's older gearbox from 2010. I am sure evike gets these from JG with their orders of guns and these are the gearbox found inside a JG or Echo1 M4 carbine. It has 8mm bushing, my selector plate is black instead of yellow like the image and the mosfet has a nice hard casing to protect it from accidentals.

415 FPS out of the box on my new custom M4 running a stock JG 363mm barrel.

Over all, the item work as expected. Good strong parts and gearbox.

Great deal with a nice mosfet.

JG / CYMA 8mm Reinforced Gearbox for M4 M16 Series Airsoft AEG with Mosfet - Rear Wired
The JG Mosfet Enhanced 8mm Gearbox is a high performance and high quality release from JG / CYMA which has been proven by their release in the popular rifles. Need to replace your gearbox or just looking for something new to upgrade your old AEG? Look no further than the JG 8mm Gearbox.

- Velocity output for this gearbox is estimated to 370~460 fps.
- Wiring to the back. Includes High Performance Mosfet Unit.
- 8mm Metal Bearings.
- Ball bearing metal spring guide.
- Reinforced Piston / Piston Head.
- Reinforced JG Gear set.
- Reinforced Cylinder and Cylinder Head.
- Low Resistance wiring harness set. (May come in clear or black/red wiring wrap.)
- Reinforced Mech Box Shell.

Complete Gearbox Disclaimer:
We have compiled a series of videos for AEG take down, assembly and gearbox for your reference. Recommended for experienced players only. A "gearbox" virtually never breaks, Evike.com offers spare parts for all components. All gearboxes are sold as complete set of parts and "AS IS". All the gearbox are directly from manufacture. Buyer responsible for fine tuning and proper installation. Evike.com is not responsible for shimming it perfectly or playing the game of airsoft for you.
For more information on complete gearboxes, please visit: Complete AEG Gearbox

This product was added to our catalog on Tuesday 09 November, 2010.

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