Originally Posted by 8thArmy
you forgot to take off the scope cover mate...
If you read up on or take a practical shooting course with M4 guru Bennie Cooley, he goes into great detail about high-speed tactics and the benefits of shooting using an RDS with front scope cover still on, with both eyes open in a heads-up "ready" position, especially when transitioning from a low-light to high-light environment, and vice-versa.
It's not unlike shooting using the older Armason OEG red-dot sights, which were the cat's ass 20 years ago, before Eotech and Aimpoint became household names. But most ASC'ers were still in diapers when the OEG was cutting edge stuff....