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Kwa MP7 internals failure


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#1 Wintersx866

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Posted 01 July 2010 - 12:45 PM

Well, today I decided after receiving my 3 extra Kwa MP7 mags to relube my bolt again.  So when I opened it up, discovered that the internals were SOL.  Like its pretty much just messed up completely.  The two springs on the side were in place but the right one was snapped off, and the main spring to the white nozzle inside was just plainly gone, and the white thingy inside was just floating around randomly in there as well.  Haven't even put over 300 rounds yet through the gun...

#2 Spiggy

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Posted 01 July 2010 - 01:34 PM

ooh details!

Serial number, maybe pictures.   :popcorn:

#3 Wintersx866

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Posted 01 July 2010 - 02:44 PM

View PostSpiggy, on 01 July 2010 - 01:34 PM, said:

ooh details!

Serial number, maybe pictures.   :popcorn:
I'll get picture here afterwards in a sec.  I actually got quite an early model as its the 9800146...

#4 dobey

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Posted 01 July 2010 - 05:09 PM

My crystal ball is telling me the spring broke when you pulled the nozzle out to far and then when pressing out the pin the white valve and spring went flying.  You found the valve because it is white and decent size but the spring was gone to live under your bed with the dust bunnies.  Now you and your buddies are sitting around bitching about how this sucks when someone gets the idea that the thing is under warranty and we should bitch about it taking a dump after a couple rounds were fired off new from the box hoping that the kwa guys will make this nightmare go away.   :shocked:

Of course I am just messing around with you if you made it this far sorry :P  How was the thing still shooting?

#5 Wintersx866

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Posted 01 July 2010 - 07:58 PM

View Postdobey, on 01 July 2010 - 05:09 PM, said:

My crystal ball is telling me the spring broke when you pulled the nozzle out to far and then when pressing out the pin the white valve and spring went flying.  You found the valve because it is white and decent size but the spring was gone to live under your bed with the dust bunnies.  Now you and your buddies are sitting around bitching about how this sucks when someone gets the idea that the thing is under warranty and we should bitch about it taking a dump after a couple rounds were fired off new from the box hoping that the kwa guys will make this nightmare go away.   :shocked:

Of course I am just messing around with you if you made it this far sorry :P  How was the thing still shooting?
Actually I never even took the thing apart in the first place and what you did in the beginning was very uncalled for even if it was a joke.  I wouldn't be posting for help if I know the gun is under warranty.  Anyways I fixxed it already by getting some new springs from Lowes and redoing the return spring on the side.  Spig I'll PM you some pics on what happened later on.

Edited by Wintersx866, 01 July 2010 - 08:02 PM.


#6 Spiggy

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Posted 02 July 2010 - 10:58 AM

PM sent

#7 tiger

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Posted 02 July 2010 - 04:54 PM

Hey don't PM the pics so we can also take a look at it and be able to prevent it in the future.

#8 Najentus

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Posted 18 August 2010 - 01:08 PM

Pretty much the same thing happened to me as well, I have #284, and both one of the side springs on the nozzle broke as well as the rocket valve's spring disappearing randomly.  I fixed the spring on the side by clipping off what was left of the loop and using the next ring on the spring to re-attach it to the bar.  So far I haven't replaced the spring on the rocket valve and if you point the gun down it will recoil harder and have much lower FPS, vice versa for pointing it up.  Going to see if a spring from a piston nozzle will fit.

Edit after finally removing the small block that prevents the nozzle from moving too far forward (was extremely tight fight, sanded down a bit to make it fit better) I discovered the original spring was still in the nozzle, just pushed way down in it.  Still attempting to troublshoot this.

Edit #2:  I was able to reseat the spring in the nozzle and reassemble the gun after taking a very small amount of metal off of the bolt and block so make the fit without me needing to hammer it in.  It fired fine for about 30 rounds (would check every few to see if I could still see the spring on the rocket valve) and then the spring promptly disappeared again into the front part of the nozzle and the original issues returned.  

From what I can tell so far, I'm thinking part of the plastic on the inside of the nozzle has worn away and allows the spring to slide further in than intended, and the rocket valve itself not being returned to the same position is what causes the inconsistencies in FPS.  (When you point it up the valve is back, opening up and allowing more gas to enter the barrel of the gun, flat it seems to be random, but works around 99% of the time, and pointing down the valve is shut and little if any gas enters the barrel and the majority of the gas hits the piston cup and resets the bolt, loading another round and letting the original just roll out of the barrel.)

Edited by Najentus, 18 August 2010 - 02:18 PM.





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