When swapping or adjusting sights on different platforms, two things commonly cause mistakes: (1) different manufacturers measure sight height from different reference points, and (2) front- vs. rear-adjusting systems move the impact point in different ways. Know these two rules and you’ll avoid most headaches.
1) Watch the measurement standard
Not all makers measure sight height the same way. Before you order, confirm the reference point being used:
- On compact platforms, front-sight height is often measured from the top surface of the upper housing to the top of the sight.
- On longer-platform systems, front-sight height is more commonly measured from the bottom of the sight’s mounting slot (the base) up to the top of the sight.
The same numeric height can fit very differently depending on which reference was used—so double-check first.
2) Which sight moves the impact — and which way?
Think of sights as steering controls for your point of impact. There are two common setups:
A. Rear-adjusting systems (most common)
- Move the rear sight in the same direction you want the impact point to move.
- Example: If your impact is low and right, move the rear sight up (to raise impact) and left (to shift impact left).
B. Front-adjusting systems (some designs)
- Moving the front sight produces the opposite effect on impact location.
- Using the same low-and-right example, move the front sight down and right to shift the point of impact up and left.
Quick checklist before you start
Photograph the initial setup so you can track changes.
Confirm the height reference used by the sight maker.
Identify whether your platform is rear-adjusting or front-adjusting.
Make small, incremental adjustments and test after each change.
