Rough Metal Material I am trying to recreate the FN P90 submachine gun.
I followed a tutorial on modelling and UV unwrapping.
Now I tried adding Procedural Textures to it.
The gun body is made up of a rough finished black painted metal.

For this I tried this node Setup:


But it does not work. Do I have the wrong approach? How would you go about making a painted rough finished metal?
Use the Principled BSDF Shader as a basis and then add in maps for roughness and normals to achieve the look you're going for. This makes life a lot easier.
You can use this tutorial as a basis. Blender Guru Tutorial
This is an example setup for a bumpy Plastic. Turn the Metallic slider up if you want metal.