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KWA M4 broken gearbox

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Old December 23rd, 2009, 18:02   #1
Yankee
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KWA M4 broken gearbox

Hi,

Just play winter game.. And my KWA M4 gearbox just crack.. In the front.. So what to do? I ould like to update for a v3. But witch one? Does kwa need particular model of gearbox?


thx
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Old December 23rd, 2009, 18:03   #2
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You need the same type of gearbox, V2.

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Old December 23rd, 2009, 18:07   #3
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All M4's use a version 2 mechbox....you need to replace it with a version 2 (version 3's are a different shape)

to fix it:
1. Buy a replacement v2 mechbox shell
2. swap the internals and everything else into the new shell...reshim, etc...fingers crossed it works. Down grade spring to m90.
3. Break that one in the cold as well and realize that you'd be better off with a V3 gun for the winter...or a PTW if you have to have an M4. (just kidding)
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Old December 23rd, 2009, 18:15   #4
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i've heard KWA has some pretty good support. perhaps try talk to KWAUS and see what they can do
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Old December 23rd, 2009, 18:25   #5
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hmmm i think you'll need another KWA mechbox shell... i have a kwa m4a1 and the shell is different (reinforcement-wise) than a standard marui-spec one... not sure on that one but migh be worth looking into...
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Old December 23rd, 2009, 18:34   #6
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If you play outside with an M4/version 2 mechbox in the winter, you are just looking for trouble. Version 2 mechboxes are notorious for breaking in the cold with stock springs. It's an inherent flaw in design, and it's not even fixed by so-called "reinforced" mechboxes, which have all their reinforcement at the gears (where it's redundant and unnecessary) and not at the front of the mechbox, at the cylinder window (where it's actually required). You can try to alleviate some of the stress on the mechbox by radiusing the corners in the cylinder window, but even that is not a proper fix.

If you intend to continue playing outside in the winter, I highly recommend you invest in an Ajax Customs Shock Transfer System:

http://v2fix.com/
http://www.tacticalairsoftsupply.com...er-system.html
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Old December 23rd, 2009, 18:40   #7
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Quote:
Originally Posted by lemegacool View Post
hmmm i think you'll need another KWA mechbox shell... i have a kwa m4a1 and the shell is different (reinforcement-wise) than a standard marui-spec one... not sure on that one but migh be worth looking into...
Any standard V2 shell would probably work for him.
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Old December 23rd, 2009, 18:51   #8
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Ok, thank for your advice.. I will look for a V2 KWA.. And another gun for the winter, haha.. Witch temperature a V2 support? (if was just -5 today).
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Old December 23rd, 2009, 18:54   #9
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Any standard V2 shell would probably work for him.
Not a sure bet, when the KWA M4s first came out, it was reported that their body pin hole is slightly offset compared to other version 2 boxes. Better check with KWA to make sure they fixed that before buying just any version 2.
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Old December 23rd, 2009, 18:58   #10
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KWa are out of stock of gearbox... Damn.
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Old December 23rd, 2009, 20:02   #11
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I had the same problem with my KWA gearbox recently, except it was caused by me forgeting to loctite my modify piston head to the piston and it breaking loose. The KWA gearbox is NOT a standard V2 their new 2GX gearbox is coming out soon, another option is to contact them through their help desk at http://support.kwausa.com/access/una....kwausa.com%2F They may have some shells around the shop that they can part with.
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Old December 23rd, 2009, 22:47   #12
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The V2 Shock transfer system fix will not work on KWA because of the hop up unit being different (two peice). Also if you get the new 2GX bear box it will be strong at the front (one of the new improvements). If you go to the KWAUSA.com forum there is a post on fixing it by brazing it if you have someone that can oxy-acet. heat it and braze it for you.
Were you using the stock spring?
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Old December 23rd, 2009, 22:58   #13
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here is a link showing the improvements .....
http://www.kwausa.com/forums/index.p...x&fromsearch=1
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Old December 24th, 2009, 11:07   #14
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The V2 Shock transfer system fix will not work on KWA because of the hop up unit being different (two peice). Also if you get the new 2GX bear box it will be strong at the front (one of the new improvements).
Hot damn. I stand corrected. Nice looking gearbox too.
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