A robust red dot indeed - Aimpoint Micro T-2 1x18mm Reflex Red Dot Sight

This red dot sight is simple and all the brightness settings are great for different scenarios. Can use it in extremely bright conditions as well as very dark environments as well. The red dot is very crisp. My friend who has astigmatism loves this red dot because the dot stays very fine and has very little distortion when he looks through it.