Question: what is a 1 moa red dot?
Answer: The illuminated red or green dot of a red dot/reflex sight is measured in MOA—minutes of angle, a unit for angular measurement of a circle. 1 MOA is equal to 1.047 inches at 100 yards, which we round down to 1 inch. Meaning, the circle (red dot) will appear to be 1 inch in diameter on a target 100 yards out.