That's for the T-1, buddy. He wants it for Comp M3.
By "below" meaning the co-witness is between absolute and lower 1/3rd, but closer to absolute in that the dot and aligned sights sit just at or below the the center line of the optic.Absolute Co-witness is okay ( I use that height anytime I run fold down sights to get the sight as close to the boreline as possible. If you have fixed sights, you never want to be below absolute co-witness. Most prefer either a little above the front sight (Aimpoint 39mm height on a standard AR) or a full lower third (LaRue "Tall" on a standard AR).