Substance painter to Blender issues...

Ok so I’m working on a SciFi handgun. Im completely done with everything, the model, the materials… well everything…
The last step was to plug in the textures that I have into a node tree that I already used (!!) and make the last final renders.
The results were not as expected and I tried literally everything I knew, but I simply can’t get it to look right.
I can’t even pin point where the issue comes from, it looks like its a normal map issue and the blender smooth shading problems, but I tried every combination, nothing worked.