Welcome to the forum.
Looks like a hobby piece. Multiple layers of cerakote, duracote, or something similar with digital stencils. You can see the thickness of the paint above the trigger and to the right of the slide stop. It appears the dark brown was the base color. The grip module looks better than the slide; I'm not sure what was done to it. Possibly started with a natural stainless slide. Whoever did it put a lot of effort into it. I have an X Carry in black Nitron with a Wilson Combat Carry II grip module, an excellent, reliable pistol.
Looks like a hobby piece. Multiple layers of cerakote, duracote, or something similar with digital stencils. You can see the thickness of the paint above the trigger and to the right of the slide stop. It appears the dark brown was the base color. The grip module looks better than the slide; I'm not sure what was done to it. Possibly started with a natural stainless slide. Whoever did it put a lot of effort into it. I have an X Carry in black Nitron with a Wilson Combat Carry II grip module, an excellent, reliable pistol.