All right.... the pistol works again

I have contacted the previous owner and found out that the toggle pin that is wrong is actually a custom made that prevents a complete closing of the bolt. A blank round would not cycle the autoloading mechanism if fully closed, it was tested.
My problem why the gun did now work was that the coupling link (T shaped) did not catch itself into the recoil lever hooks . I have to do it under a specific angle or what... I saw it when assembling without grips.
Now all is OK again

Thanks for any directions posted before!