Matrix G2 Complete Gearbox Assembly for TM Compatible V2 M4 / M16 Airsoft AEGs (Type: Front Wire / 350 FPS)

"This gearbox is very good. i have taken it apart for a spring swap and had this chance to view the parts closely ( i will list the parts and quality at the end). I bought the gearbox for a g&g raider and had to customize the wires in order to makre it work. but afetr all of the cusomizing i have found it to be an excellant gearbox for the money.

part/quality
m130 spring/good
bearing bushings (not ball bearing)/excellent
torque gears/excellent
ported cylinder/excellent
plastic cylinder head (one o-ring)/good
air nozzle (no o-ring)/good
plastic piston with full metal teeth (second tooth is not removed)/excellent
plastic piston head (not sure if it is ball bearing)/excellent
full metal spring guide (not ball bearing)/excellent
standard v2 tappet plate/good
standard trigger box/good
standard anti-reversal latch/good
Reinforced steel gearbox shell/excellent(only time will tell)
silver low resistance wiring/excellent

Only time will tell for the durability of this gearbox, please remember you may not get a gearbox that is as duable due to factory issues, so be ready for the liability. overall great gearbox.

"Pretty good drop in gear box but one super important thing to know . The stock MOSFET has a sensor that is under the sector gear and is controlled for Semi Auto by a magnet that is on the stock gear. I did not know this when I was putting in SHS gears. Got the gearbox together to test it and would only fire full auto. What am I saying? Well if you plan to upgrade the gears either A) make sure the sector gear has a magnet on it, B) only upgrade the other two gears or C) buy/upgrade to a different Mosfet. It took a lot of troubleshooting before I figured this out. Hopefully I can save someone else some head scratching and heartache. Personally I wont keep the MOSFET considering the fact of the sector gear.
Overall stock it is okay for the money, came in on the chronoavg of 341 fps @ 1.38J. But if you plan to upgrade everything (sure you can keep the stock parts as backup) but probably just better to buy all the parts individually.

"I bought this gearbox to replace an old gearbox that had issues.
Taking it out of the box everything looked in order. I dropped it into my KA OA-15 M8 and tested the weapon. The first 10 shots seemed decent, that's where it goes bad. After about the 10th round bb's started flying everywhere, dropping, rising, no consistency whatsoever. 50 Ft shot group was about 15 feet wide. So I checked out my barrel / hopup to see if there was something wrong with the gun, nothing found. So I decided to look further into the new gearbox... I opened it up.

Inside
There was rust on the gearbox housing internally.... yup....
Bushings not Bearings
There was enough grease to drown the fonz (old reference?!)
The cylinder had almost no air seal / compression
The Air nozzle and piston had the quality of a cheap model car set.
Horrible Shimming
The spring had no... spring...

So I paid to basically get a set of spare parts, which I was able to use to create a decent gearbox when I cleaned it up, reshimmed, put in a new spring, piston, air nozzle and properly sealed the cylinder.

I gave it a two for two reasons -
First, at least all the parts were there?
Second, the wiring harness and mosfet were in excellent condition.

"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

"I am a retailer buying several thousand dollars of product from Evike and continue to do so. I have purchased 3 of these gear boxes. They all had issues with poor shimming and poor quality parts. I sold the bodies to customers who had bought the same gearbox and had the shell crack. Hopefully the next batch of gearboxes JG puts out are better. I give this particular gearbox and big thumbs down. Overall JG makes excellent quality products, I still buy a ton of JG products, just not this gearbox.