kwa m4 gearbox

[blitz]

i have a cracked gearbox in my kwa m4 and dont want to shell out 90$ to get a kwa replacement.
does anyone know if the king arms 9mm gearbox would work fine?

i am wanting to just swap everything over from the cracked one to the new one because everything in there is still fine

[Blitzkreig]

1. You have accomplished a very difficult feat. You must have been using a LiPo and a heavier spring. Well, that's what happens.

2. I believe the gearbox shell is proprietary. Maybe not, but maybe.

[blitz]

lol yeah i am not sure what spring and battery were used i bought it like that
(knowing of the issue ofcourse)

i have been searching around on the world wide w but cant find anything saying if it will work or not.
if i really have to i will get another kwa but i dont want to if i dont have to

[Toan]

Hmm thats weird, I've been using a m150 in my sr12 for the longest time without any hiccups. I would just spend the money to get another 2gx gearbox, its a kwa, try to keep it original (with stock kwa parts that is). Also you know it will fit so there will be no heartache there trying to figure out of some foreign gearbox could cram itself into the receiver. IMHO, save yourself the time and trouble and stick with the 2gx gearbox.

[Minerva]

Oh yeah, go back to the very same flawed gearbox that broke

OP: Do you have a budget?

[Toan]

Oh yeah, go back to the very same flawed gearbox that broke

OP: Do you have a budget?

I don't understand how you get the word "flawed", I've ran 2 kwa sr12s with both running m150 springs with 30c+ lipos for over a year on stock parts but the spring and motor and theres not one "flaw" inside the gearbox and obviously he stated that he did not know what spring/battery was used from the previous owner, for all we know the previous owner could have done poor maintenance to the gearbox and blew that shit up.

Of course with every great company, there are ALWAYS lemons, maybe you got a lemon gearbox, I know plenty of people I play with that cracked their 2gx gearbox running only m110-120 springs for only a couple days.

Back to the OP, I'm just saying go with what you know, why waste time and money trying to fit something else that could end up not fitting inside the receiver in the end?

[Minerva]

I don't understand how you get the word "flawed", I've ran 2 kwa sr12s with both running m150 springs with 30c+ lipos for over a year on stock parts but the spring and motor and theres not one "flaw" inside the gearbox and obviously he stated that he did not know what spring/battery was used from the previous owner, for all we know the previous owner could have done poor maintenance to the gearbox and blew that shit up.

Because a gearbox that comes with gears that are not shimmed and not compatible with other things due to it not being TM spec, makes it completely worth the money. There isn't ONE thing that makes a KWA anymore well built then a nice G&P or a slightly tuned JG. It's just a big "LiPo ready" marketing gimmick. Sorta like how Apple markets things to make you seem "cool" if you have them, when in reality they are under-preforming pieces of sh**

/rant

Back on topic: Not much you can do about the actual gearbox cracking. You have to throw a VERY powerful spring in there or have a crappy gearbox *cough*KWA*cough*

[ogrejager]

It's just a big "LiPo ready" marketing gimmick. Sorta like how Apple markets things to make you seem "cool" if you have them, when in reality they are under-preforming pieces of shit.

Why is it that I hear this so much from 17 year old kids and people that "claim" to know about airsoft. Yet, when I talk to store owners and gun techs that have worked on thousands of guns, they really like the KWA's.

And before you go "oh, they're just in it for the money," I've heard it from local techs that I trust--and many of you probably do, too.

[dom186]

I've heard countless times how good the kwa internals and gearboxes are. When I go on forum classifieds from all kinds of airsoft websites, I see WTB or WTT requests all the time for KWA's. Not once have neither seen one for a JG or G&P nor heard that a JG or a G&P has good internals or gearbox, until today.

Any ways I agree with you (sarcasm), because last time I checked a KWA gearbox was used to break to world record in ROF from an airsoft gun. That was a while ago, so I could be wrong.

[Nec]

1. You have accomplished a very difficult feat. You must have been using a LiPo and a heavier spring. Well, that's what happens.

Breaking a KWA gearbox is no difficult feat by any means, especially their 1st gen gearboxes. I've seen more than a dozen instances where a KWA gearbox has cracked although by no means am I saying they're more or less prone to cracking, just stating they do in fact crack.

Below is a picture of the latest cracked 1st gen KWA gearbox that came to me. This was used under stock conditions for a little more than a year with heavy use. The gearbox was taken apart a few times before but no parts were changed or replaced and I might add this person did not use any type of lipo batteries on this gearbox, only NiMh and NiCads.

2. I believe the gearbox shell is proprietary. Maybe not, but maybe.

Yes and no, KWA uses standard version 2 (and version 3 for their G36c) gearboxes although many gearboxes do not fit properly fit in KWA receivers such as, but not limited to; CA, G&P, and Echo 1. They may have changed this with their gen 2, although I doubt it.

[Minerva]

Why is it that I hear this so much from 17 year old kids and people that "claim" to know about airsoft. Yet, when I talk to store owners and gun techs that have worked on thousands of guns, they really like the KWA's.

And before you go "oh, they're just in it for the money," I've heard it from local techs that I trust--and many of you probably do, too.

I've had a few (3 to be exact) bad experiences with the KWA V2 gearboxes. Partly because of the V2's weak design near the cylinder assembly and the other time was due to the spur gear coming out of place and grinding my sector gear into bits and pieces.

If you think that age has any relevance to this sport you are sorely mistaken, though I do agree much can be said to how age adds to maturity. Having patience, a little mechanical know how, and spare time, does not require me to be 25.

Don't get me wrong, the KWA 2GX is a decently built gearbox, but with the proprietary form factor and problems with the gears, at least for me, I don't honestly think it's worth the money. For the same amount of money I could build a more reliable gearbox that runs like a race car and is as durable as a tank. You also have to take into account that what goes into the gun really doesn't have as much to do with how it performs as to how it was put together.

EDIT: Also to the person who said something about classifieds, there are currently 0 WTB or WTT for a KWA that have been posted recently. Only WTS ads

[pappyjump]

Its the huge KWA discussion going on AGAIN. Some peope love em, some people hate em. I love both of my KWAs and i only buy KWA guns. I have never had a gearbox malfunction in over 2 years of use in my V1 KWA m4. Just my two cents, (spend the 90$ on a new KWA gearbox)

[Reeko]

OR!!!! spend 500 on a systema revolution M160 gearbox

[dom186]

EDIT: Also to the person who said something about classifieds, there are currently 0 WTB or WTT for a KWA that have been posted recently. Only WTS ads

Nice job on checking ALL the other airsoft classifieds, especially the one on airsoftforum.com which has hundreds of pages! That is a huge accomplishment for any human! You should be put into the guineas book of world records for how fast you were able to check ALL classifieds and find no WTB or WTT ads for KWA's!

I would post a few classified ads to prove you wrong, but since I'm on my iPhone, I cannot do this. If you really want me to, then I would simply do a google search using my computer and I'm sure plenty of results would pop up

What I would do: Contact KWA and ask if the 2GX gearbox fits or not, and if it does, buy it, but if it doesn't, ask them on what you should do. KWA has fantastic customer service, unlike many other manufacturers. :P

[Paladin101]

Blitz, a non KWA gearbox will have issues fitting in a KWA receiver. I used to run Precision Airsoft and I can say confidently that KWA has one of the most reliable stock rifle designs on the market. The V1 design did have flaws, which is why they fixed the issues and issued V2. All v2 gearboxes have an inherent weak spot near the front. Now when TM designed the gearbox it wasn't a big deal because AEGs weren't shooting near what they were today, but at higher velocity they have issues. I would also recommend ordering a new 2GX gearbox. If it breaks within the first 45 days like some seem to be implying, you can send it back to KWA and they will replace it or refund you.