I picked up a two tone glock 19 with a flat(color) silver slide several years ago. When I asked the salesman about the gun, he had no idea where or who had done the slide. It almost looks powder coated, but i dont think thats what it is. I just got a gen 4 19 and would like to do the same to it. Does anyone know if this came from the factory like this or was done by someone else? any help would be great.