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KWA SR 10 Disassembly with Piston Engaged

SR 10 Disassembly Piston Engaged KWA Upper receiver stuck

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#1 Nolk

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Posted 02 January 2013 - 01:12 PM

I was swapping a spring in my SR 10 for a cqb match and when I went to test it, the gun failed to turn over. It makes a clicking noise indicating that it isn't a problem with the battery and when I removed the motor and tested it, the motor works perfect. The true problem I am having right now is that I am unable to disassemble the gun to reach the gear box. I removed the back body pin and cannot pull the receiver open. I looked online and saw a post that said you can't disassemble the SR 10 when the piston is engaged and that he was only able to open it with a rubber mallet which ended up breaking his piston. I have also tried triggering the ar latch with no success. Any suggestions?

#2 vanevery

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Posted 02 January 2013 - 03:41 PM

Take the motor out.
You can take the motor grip off if you want or are going to access the gearbox again.
Use an angled pick from a pickset:
https://www.google.c...ed=0CJsBEPICMAM
Raise the pick into the motor opening into the gearbox.
Find the ARL.
Pull downward with the the pick on the ARL and the ARL will release, thus releasing your piston.
There are other ways to do this, this is how I do it.

What is your spring rating?
Is your spring linear or non-linear / irregular pitch?

#3 niko_gpsy

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Posted 04 January 2013 - 02:41 PM

Have you tried fully charging your battery?  Or trying another one?

#4 Nolk

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Posted 04 January 2013 - 04:33 PM

Sorry I've been quite busy lately.

vanevery: I tried releasing the arl with no success, I'm fairly certain I did it right but I'll try and release the arl again...and it is a linear spring, not sure of the rating.

niko_gpsy: The battery was fully charged the night before and I tried a 11.1v lipo after my 9.6v failed.

#5 Nolk

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Posted 06 January 2013 - 10:00 PM

I tried the arl again with no success, I'm still unable to dissasemble the gun.

#6 vanevery

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Posted 06 January 2013 - 10:08 PM

You can get it.
Most of us have ran into this situation more than once.
I still suggest what I said in initial reply post.
This time, take your motor out and motor grip off. Get a good eye on the location of the ARL.
Insert the angles pick and go up and over the ARL.
Pull down. It will take more force than you expect.
The key is getting the angled pick properly placed over the ARL so it does not slip off as you tug it down.

#7 Nolk

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Posted 22 January 2013 - 12:31 PM

Alright, it took me awhile to get back in town and try it again. The ar latch again didn't work, I am positive I triggered it. I did get the gun disassembled by slowly rocking it open. The piston was still engaged and held back. It was a faulty spring but I replaced it and everything is working.
Thanks for the help guys.





Also tagged with one or more of these keywords: SR 10, Disassembly, Piston Engaged, KWA, Upper receiver stuck

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