Ataman M2 .35 help

I have a air leak from the barrel.The poppet came out OK but the poppet guide doesn't seem to want to budge. On the schematics it looks like 2 O rings is all that's holding it in. Does anybody know the trick to pulling out the valve guide? Its the brass part.

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Trying to recall as I don’t own my bullpup anymore.

They use a lot of pins through the body of the action. If I recall properly.

Is there anything on the side like pin or set screw that could be holding it in place.

Can u post the assembly drawing?
Thank you for the tip, I didn't think about a pin holding it in!