Hey Bruce I don't know if you figured this out yet, but I called the Night Fision company directly. I was told that it is the Sig sights, and that it is 8 front and 8 rear.
From the video, Brian’s answer is wrong. You want the sig suppressor height sights. When you use the Night Fision suppressor height sights and the Trijicon RMR, the red dot will be exactly where the front sight post is…it takes a bit of getting used to, but I’m not sure how you find a better sight combo to get the 9mm to the center of mass…just add a sure fire weapon light …and it might be near perfect