For those that are new to shooting rifles. Don't see as sharply as you used to? A 2 MOA red dot is an excellent aid to shoot relatively accurately at short range. With the correct mount height you can co-witness with your flip up iron sights or just use the red dot sight on its own without iron sights at all. Once your dot is zeroed at your preferred range, your point of impact will be wherever your eye sees the dot on the target. If you have your sights co-witnessed with your dot at your zeroed distance your dot will be appear hovering exactly on the top of your front sight post when you align your front and rear iron sights. A minute of angle (MOA) represents 1" at 100 yds, so a 2 MOA dot will essentially cover 1" of the target at 50 yds, 2 inches at 100 yds and 4 inches of your target at 200 yds.