As I know and was discussed in this forums, the red dot (reflex probably too) is a lens system. They is no dot painted on the glass, which would require an exact lining up as ironsights, but it is a light, that is reflected by the lens you look through. That way the red dot works like a laser pointer that is only visible through the sight.
If you would hold a G36 not steady, where the weapon is pointed a bit lower and a bit to the left, you would see the dot atthe lower left too, but exactly where the barrel is pointed at (like a crosshair).
Of course if the barrels line is way to much on the right, the dot is not visible through the sight. But to reach this, you really have to look through the sight from the side.
The dot marks where the wepon is pointing at, but that is only visible inside the scope like sight.
Hope I´m finally correct on this (?).
If you would hold a G36 not steady, where the weapon is pointed a bit lower and a bit to the left, you would see the dot atthe lower left too, but exactly where the barrel is pointed at (like a crosshair).
Of course if the barrels line is way to much on the right, the dot is not visible through the sight. But to reach this, you really have to look through the sight from the side.
The dot marks where the wepon is pointing at, but that is only visible inside the scope like sight.
Hope I´m finally correct on this (?).