1) My shots are hitting inches high/low.

2) I am shooting from a distance of feet

3) Select your gun model:

4) Click Calculate:

Result:

The number in the Results box represents how much shorter (or taller) your front or rear sight needs to change.
-- If you are shooting LOW, then you need a taller rear sight or a shorter front sight.
-- If you are shooting HIGH, then you need a shorter rear sight or a taller front sight.

AmeriGlo offers a variety of rear sights (plain black and tritium) in the following heights:
.256", .271", .287", .311", .393" (6.5mm, 6.9mm, 7.3mm, 7.9mm, 10.0mm)

AmeriGlo offers a variety of front sights (plain, serrated, white dot, tritium) in the following heights:
.165" (standard factory height), .180", .200", .220", .240", .260", .280", .300", .315", .330", .350"

You will need to know your current sight heights to correctly replace it.
-- The standard height of a Glock plastic front sight is .165". (measure only the sight blade)
-- Glock offers a variety of rear sights, indicated with a series of dashes. Glock refers to these heights as +0 (6.5mm), +1 (6.9mm).