American Air Arms Evol mini .30 degassing

Where is the burst disc on this rifle? I don't have it with me at the moment but here are pics. I've seen the discs on other AAA rifles but this appears to be a little different.

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Very easy to degass and work on! Replaced the poly poppet o-ring and the foster o-ring while I had it apart. Gassed it up to 4500psi and it still leaked. Degassed down to 1800 and got out my leaky Edgun Eazy-fill to sort of "bounce" the poppet into the foster seat. Seems to have worked. Still holding at 4.5k.

The two ragged C shaped pieces were around the stem of the poppet valve when I removed the old o-ring. Almost like trash from machining or.....? I could not think of any legit reason they would be there.

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