cycles texture bake is black

[Meow]

So i baked the materials of my gun and some of the baked images are almost fully black, while others baked perfectly normal. My model is made out of 1 object, with 11 materials. The normals seem to be ok, i also recalculated them a few times and the uv maps are good too. I use a hdri for lighting. I dont know whats causing this, pls help