CYMA Standard Complete 8mm Version 2 Gearbox for M4 Series Airsoft AEG (Type: Rear Wired / With Motor)

"Bought this thinking it would be a cost effective gearbox that would keep me within the regulations for indoor/cqb play...WRONG!!!

This gearbox is a BEAST

Shooting Data:
390fps at 1.28J - 0.20g BB's
308fps at 1.34J - 0.30g BB's

Installed in a KWA SR10 - KWA Hop Up - 70deg Bucking (Madbull)

"Great Gearbox!

Put this in my 15yr old KWA SR10 and it works great.

The fit is a bit tight, but it all functions well.

With an 11.1v lipo I am getting around ~30rps.

"THIS REVIVED MY CYMA M16A4 BACK TO LIFE AFTER 4 MONTHS WOOOOOOOO

"Got this gear box In today! Pretty solid gearbox. I picked it up for my short m4 so I can use it more on the fields. Seems to hit hard, I would say the fps is around the same as my Kwa sr10 (about 400). That's just judging from the speed of the bbs won't know the true fps till I take it out on the field. Great gear box, the only issue I ran into was it didn't fit in the metal body at first had to do some moding to the body and gear box to get it in. I'll make sure to put my fps reading in on the comment section soon.

"PLEASE NOTE THAT THE FOLLOWING IS MY PERSONAL EXPERIENCE WITH THIS PART
When the gearbox in my m16a4 ended up being a lemon, I was sorely disappointed. I now had a hundred-sixty dollar display gun, that is, until I discovered Evike. I found this gearbox and I was certain that it would be a great replacement. I couldn't have been more right. It is rear wired, with a CYMA-style fuse box that accepts 20 or 19mm fuses, which helps to protect your gearbox. It fit my rifle perfectly, and while the wiring is a bit short for a full-stock m16 rifle, it is easy to connect the battery nonetheless. For me, it is loud, mean, and effective. If you have an AR platform AEG that needs a gearbox or even an upgrade, please consider the JG Complete 8mm Ver.2 gearbox!

NOTE
It comes with a motor along with the gearbox
Please remember to have spare 20 or 19mm fuses in case

PROS
Metal construction
Decent FPS
Rear wired so you can keep the aesthetic appeal of your AR!

CONS
I haven't had any yet!

Thank you so much, Evike!

"Best Gearbox for the price! Shot faster than a friend's $300 upgraded gun!

Pros:
Very powerful
Shoots far
Shoots fast
Full Metal
Lipo Ready

Cons
Spring so powerful my 9.6 butterfly couldn't pull the spring.
(had to get a lipo anyways)

Notes: At first this gearbox did not fit in my elite force cqb if that's the problem do some shavings on the inside of you lower receiver. If you have trouble just take it to your local shop or field. I run an 11.1 lipo in this and it works great! Happy Airsofting!

"i just fit this v2 with a new matrix metal body and its very snug. cant wait to start breaking it in on the field

"great gearbox, loseley shimmed (not sure if this is a problem becuase it shoots fine), installed a non ported cylinder for use with a 509mm barrel, so far so good.

"Very nice gearbox, come with everything you need other than the motor. Shimming is very nice. I put this box into my gen2 SRC m4 with no trouble what so ever. I hope they will make a verion3 gearbox like this for my other 2 AEG's

"I have this gearbox and love it! I put an ELEMENT M175 ($12) spring in it and i am the hardest hitting M16 sniper rifle on the team. I chrono from 590- 620fps .2 gram BBs no lie. the gears have been handling it well. I opened the gear box after 1month of play and everything in the gearbox looks like its brand new. Really high quality gears and parts a real reinforced shell you will have for ever, too good for the money. Buy it upgrade it! You will love it!

"Excelent box. Does not come with motor so ull need an extra one. It pulls an m130 so fps is high. I recomend a .30 bb because .28 were still being thrown all over the place. it fits nicely but the rear body pin has trouble fitting in. Excellent overall with few problems

"This is a good gear box, I used it on an m4 with madbull tightbore and I got about 450fps now I am ussing it on my MP5 with a 120 spring and madbull tightbore and I get around 380 to 390 fps. I did have to change out slecetor plate, air nozle and the triger to get it to work on my MP5.

"If you plan on putting this or any other M4/M16 GB into a SCAR you have to swap the air nozzle and the selector plate. tried to swap this gearbox out of my friends s-system into my echo1 scar and i had to open them up to do it. great gearbox for the price.

"I am going to buy another one of thiese boxes.. But with a G&P Hopup Unit and a Madbull Tightbore Barrel it was 420FPS! with a Stock Barrel it was olny 390FPS. This is a Good Stong Gearbox Lots of parts are Strong and with a M130 You will have a high FPS and a Good RPM.. It should fit in a Classic Army Body Just fine..