G&G G96 bolts 'valve knocker' not sitting properly

[el5hag5hag]

You can see how it sits in this image http://i.imgur.com/806k98k.jpg

As far as I can tell it should push all the way forward into that space where you can just make out the spring.

My sniper is not firing because no gas is being released from the mag. The lever within the trigger does not push out against the magazine when the gun is cocked. This is because the valve knocker in the bolt does not go far enough forward to push against the lever. I have taken it apart to see what I can change but I am unsure.

I have played with the bolt a lot and I cant see how to fix it, this might not be a common problem but if anyone owns this gun I would be grateful for any advice or photos on how the valve knocker mechanism works.

Any help would be much appreciated.