Help need with KWA CZ75 - Gas retention/jamming

[loctez]

Full disclosure, I know close to naff all about gbb pistols.  I had a WE glock and that just "worked".

Picked up a KWA CZ75 second hand, first few shots through the crono absolutely fine.  Second mag in however the slide jammed and gas retention went through the floor, 5 or 6 shots per full mag.

Excuse terrible photos but found all this inside the rif.  I am guessing this is a failed part, any ideas what this would be?  I am happy to strip it down further but will start with questions here. 

Cheers!

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[EDcase]

Yep, somethings gone pop.

Looks like plastic so have a closer look at the nozzle.

 

[BigStew]

Can you give us a picture of inside the slide? Being plastic I would also assume something to do with nozzle. Also is the rubber in the top of the mag intact?

 

[Guest]

KWA almost always fail at the nozzle seal first. All KWA nozzles seals are a kind of translucent rubber, so guessing it’s part of that

 

[loctez]

Closer look this evening, looks to be component number 30 missing?

Have I got that right, anyone know where to get a new one?

Also unsure how to strip this down any further, assistance needed cheers!

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[BigStew]

google is your friend https://www.fire-support.co.uk/product/cowcow-tech-ksc--kwa-enhanced-15mm-piston-head-cctkwa003