How can I achieve a darker black plastic using PBR metal/rough? Even if I crank the blacks all the way to 0, (which I should not be doing) I still get a gray result. I have seen some smart materials out there on the market using a simi-metallic value for dark plastics, but I don't know if I'm willing to break that rule without asking around first.
The muzzle device and optic on this glock are metal, while the frame is plastic. They all have about the same black value.