Image above shows a 6 o'clock hold. Red dot represents POI.
1. sight alignment - front sight and rear sight lined up.
2. sight picture - sights are also in line with the target.
POI (point of impact) -- point where bullet hits
POA (point of aim) - point where you set your sights on the target.
Adjusting Sights:
1. move rear sight in the same direction as desired POI or
2. move front sight in the opposite direction as desired POI.
Depending on sights, adjustments can be accomplished by filing down, replacement, turning a screw, tapping, etc.
1. Fixed dovetailed sights are usually adjusted for windage by tapping.
1. Fixed dovetailed sights are usually adjusted for elevation by filing or replacement.
3. Adjustable rear sights - turn screw to adjust.