If you mean the shape of the stippling outline, I use the existing outline the gun already has and expand on it. If you mean the texture pattern, its just tiny dot next to tiny dot. That is why it takes such a long time. If you are going to try it, I highly recommend practicing on a piece of plastic that is scrap or something. The texture is raised from the plastic as it melts. You don't have to press hard either, just a light tap and it will melt a tiny dot. I do recommend that you apply your dots at random intervals and not in a line. The line is faster, but shows up as tiny lines. The random intervals look more like sandpaper.
