The EoTech Holographic weapon sights are by far the best sighting system for close quarters combat. Target acquisition is instantaneous. This is why the military uses them in combat. EoTech is simply the best there is. They are not cheap but they are the best for combat situations.
The EoTech 517 holographic sight is the newest and is even better, which is hard to believe.
Read the outstanding reviews on the EoTech 517 Holographic weapon sight here….EOTech 517.A65 Holographic Sight
Here is a review video on the EoTech 517 Holographic Weapon Sight