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USP SERIES CYCLING PROBLEMS


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#1 papabois

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Posted 05 July 2014 - 07:29 AM

Hi all,

I'd like to share a mod that I did, to my malfuctioning USP .45.

My pistol would sometimes not load another BB, the slide would not lock back when empty-mag, and gas efficientcy blew (pun intended).

The problem was the rubber o-ring in the blowback cyclinder, was undersize making gas leak past it.

I simply installed the rubber seal backwards.  Doning this, will make it expand when you bolt it back in place.  You can't full tighten the bolt, so either clean and thread-lock it into the desired position, or get a longer bolt and trial & error file it short, till the desired setting is reached.

Result, perfect functioning KWA pistol.

:)

#2 gcw360

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Posted 05 July 2014 - 09:30 AM

Can you post pics?

#3 papabois

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Posted 09 July 2014 - 05:23 PM

View Postgcw360, on 05 July 2014 - 09:30 AM, said:

Can you post pics?

I'll take pics tonight, post tomorrow.

#4 niko_gpsy

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Posted 10 July 2014 - 03:34 AM

View Postpapabois, on 09 July 2014 - 05:23 PM, said:

I'll take pics tonight, post tomorrow.

Nice.  I would like to see that as well. Thanks for the info!

#5 papabois

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Posted 10 July 2014 - 01:42 PM

Forgot.  For sure tonight.

#6 papabois

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Posted 11 July 2014 - 12:28 PM

Posted Image

Unsrew the bolt and alu piece holding in the green o-ring, and turn it around.  Then install the bolt and threadlocker, as per the instructions in the OP.

#7 gcw360

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Posted 11 July 2014 - 02:35 PM

View Postpapabois, on 11 July 2014 - 12:28 PM, said:

Posted Image

Unsrew the bolt and alu piece holding in the green o-ring, and turn it around.  Then install the bolt and threadlocker, as per the instructions in the OP.
Presumably that picture is before the switch?

#8 papabois

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Posted 13 July 2014 - 11:07 AM

Yes, just an identifying pic.

#9 gcw360

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Posted 13 July 2014 - 11:59 AM

OK, thanks.




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