Because we need yet another generic Eotech style holographic sight, right?
Based on the vanilla Aimpoint/Combat Scope, confers -1 Concealment/+4 Stability.
Probable Future Asked Questions: Q: The sight is too far back on weapons!
A: The weapon sight is intentionally modeled further back, since I am a weirdo who likes jamming sights in front of my eyes and can't be bothered adjusting optic positions on every single weapon in the game.