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A correct AR-15 sight picture is simple: center the front sight post in the rear aperture, keep the post vertical, and place the post tip on the intended point of aim. The hard part is knowing what that should look like when the rear sight is blurred, the target is moving, or a red dot is sitting in the same window.
This guide shows the sight pictures people ask instructors to explain over and over: aperture irons, A2 posts, HK-style hoods, notch/post sights, absolute co-witness, lower-third co-witness, and the most common alignment mistakes.
Key takeaway: With iron sights, your front sight post is the reference. The rear aperture and target can blur. With a red dot, your target becomes the reference and the dot rides on it.
Choose a sight picture
Switch between AR aperture, A2, HK-style, notch/post, and red-dot co-witness views.
Correct AR-15 aperture sight picture
The front sight post is centered in the rear aperture, with the post tip held at the intended point of aim.
Correct Sight Picture by Sight Type
| Sight type | What should be centered | Primary focus |
|---|---|---|
| Rear aperture and front post | Front sight post centered in the rear aperture | Front sight post |
| HK-style front hood | Circular hood centered in the rear aperture, post centered in the hood | Front post inside hood |
| Notch and post | Equal light on both sides of the front post | Front sight post |
| Red dot with irons | Dot on target, irons either centered or held in the lower third | Target and dot |
Common Sight Picture Mistakes
| Mistake | What it looks like | Correction |
|---|---|---|
| Front sight too high | Post tip above the aperture centerline | Rebuild cheek weld and lower the post to center |
| Front sight too low | Post tip below the aperture centerline | Raise the post to center before pressing |
| Left or right bias | Unequal light around the post | Center the front post before judging windage |
| Target focus with irons | Target sharp, front post fuzzy | Shift focus back to the front sight post |
Co-Witness Sight Pictures
Absolute co-witness puts the red dot, rear aperture, and front sight post on the same centerline. Lower-third co-witness keeps the dot centered in the optic while the deployed iron sights sit lower in the window. Both work. The choice comes down to whether you want irons constantly in the center of the glass or lower in the window until needed.
If you are setting up backup irons, start with our iron sights, flip-up backup sights, HK-style backup sights, and rail-height A2 front sight. For dot setups, compare red dots and the Rhino red and green dot reflex sight.
Sources and Related Guides
- Line Up AR-15 Iron Sights for Perfect Accuracy
- How to Use Iron Sights on AR-15 Effectively
- How to Zero a Red Dot Scope
- How to Zero M4 Iron Sights
- How to Adjust Iron Sights
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<a href="https://ozarkarmament.com/resources/ar-15-sight-picture/" title="AR-15 Sight Picture Visual Guide">AR-15 sight picture visual guide</a><p style="font-size:12px;color:#666">Source: <a href="https://ozarkarmament.com/resources/ar-15-sight-picture/">Ozark Armament</a></p>Frequently Asked Questions
What should an AR-15 sight picture look like?
A correct AR-15 iron sight picture has the front sight post centered in the rear aperture, with the post tip held on the intended point of aim. The front sight should look sharp and the target can look slightly blurred.
Should I focus on the front sight or the target?
With iron sights, focus on the front sight post. The rear aperture will naturally blur and the target may be slightly soft. With a red dot, focus on the target and place the dot where you want the shot to go.
What is the difference between absolute and lower-third co-witness?
Absolute co-witness places the red dot and iron sight line on the same optical centerline. Lower-third co-witness keeps the dot centered in the optic window while the iron sights sit lower in the window.
ARTICLE WRITTEN BY MATT RICE, OWNER OF OZARK ARMAMENT.