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How does it all work?


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#1 Oldskool

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Posted 04 June 2012 - 02:55 AM

I need someone to either post, or point me to a tutorial on how the gbb system in the USP works. i'd like to know the complete sequence of events with what each part does. I have a USP compact with a problem, and understanding how it works will be key to troubleshooting. I don't want to guess and start just replacing random parts. Thanks in advance.

- Oldskool

#2 niko_gpsy

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Posted 04 June 2012 - 03:07 AM

What kind of problems are you having? Maybe easier to troubleshoot this way.

#3 gcw360

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Posted 04 June 2012 - 08:36 AM

I agree with Niko here.  There are some things that crop up with the HK's that are easy fixes if you describe them.  This is especially true with slide cycling/locking issues.

#4 Oldskool

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Posted 10 June 2012 - 04:12 AM

It seems to be a feed and general firing issue. I get inconsistent operation overall. The slide runs, but I may or may not get a bb out the end of the barrel. Sometimes end up with a double feed. When it does fire, the grouping is 10' diameter at 20' range...seriously. I believe it may be a bucking; the gun is my son's and it has been shot... A LOT!! Maybe the best instructions you could give me are what parts to replace on a high milage gun.

I still would like to understand the function of all of the GBB specific parts. I have an excellent gtasp on AEGs, just not the GBBs.

I do appreciate everyone's help.

#5 Oldskool

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Posted 10 June 2012 - 05:29 PM

Dieregard my last post. I took the top of the gun completely apart; cleaned and relubed. When I test fired the slide runs perfectly every time; 1 BB loads every cycle, but the BB does not fire every time. If it does not fire I can put in the mag with no BBs in it (so I don't load 2) rack the slide and it fires. I seems to do this every 2 -4 cycles. The bucking still looks to me like it is swollen so I did go ahead and order one. Any other suggestions?

#6 bid2630

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Posted 10 June 2012 - 05:37 PM

See if the feed/loading ramp looks deformed.  But I'm betting that the bucking is the problem especially if it looks swollen.

#7 VictorNica

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Posted 11 June 2012 - 01:56 PM

A lot of times feeding issues are caused by the brand of bbs you are using. You may want to try using another brand.

#8 Oldskool

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Posted 11 June 2012 - 03:46 PM

This is with KSCs. We shall see what the new bucking does for it.

#9 Oldskool

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Posted 24 June 2012 - 04:20 AM

The bucking and another cleaning fixed everything. The olg one was very swolen...I could not tell how much till I removed it and had the new one for a reference.

Thanks much for everyone's help!

#10 gcw360

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Posted 24 June 2012 - 05:44 AM

Glad to hear you are back up and running.




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