The Best Zero Distance for a Carry Pistol (and Why We Use 15 Yards)

For a red-dot carry pistol, a 15-yard zero is the best all-around choice. It keeps your rounds within about an inch of where the dot sits from contact distance out to 50 yards, with no holdovers to remember.

Ask five shooters what distance to zero a pistol at and you will get five answers: 7, 10, 15, 25 yards. Each one works, but they behave very differently once you put a red dot on the slide. Below we explain why your rounds hit low up close, compare the common zero distances with real numbers, and walk through how to zero your own optic.

Why every pistol hits low up close

Your sights sit above the barrel, so the bullet starts below your line of sight. That gap is called height over bore. Iron sights sit about 0.5 to 0.7 inches above the bore; a red dot on a Glock sits about 1.1 to 1.3 inches up.

To hit where you aim, the barrel points very slightly upward. The bullet climbs, crosses your line of sight at your zero distance, then keeps rising a little before gravity brings it back down and it crosses again much farther out.

That means one thing for close-range shooting: inside your zero distance, your rounds land low, never high. At contact distance a red-dot pistol hits roughly the full height over bore low, about an inch. Any guide that says a longer zero makes you hit high up close has it backwards.

7, 10, 15 or 25 yards: how each zero performs

With a red dot, the 15-yard zero stays within about an inch of the dot at every distance below; shorter zeros climb high past 15 yards. The table shows approximate point of impact in inches (negative = low, positive = high) for 124 gr 9mm at about 1,150 fps, with a red dot 1.2 inches above the bore.

• 7-yard zero: dead on at typical defensive distances, but 2 to 4 inches high past 25 yards. That is enough to miss a head-sized target at distance.
• 10-yard zero: a reasonable middle ground, but still nearly 2 inches high from 30 to 50 yards.
• 15-yard zero: never more than about 0.9 inches off from 3 to 50 yards. The flattest practical option for a red dot.
• 25-yard zero: also flat, but it is harder to zero accurately at 25 yards, and you sit slightly low everywhere inside it.

These numbers are calculated estimates. Your exact results will vary with ammunition, barrel length and your optic's height.

Why we zero every Charlie Mike build at 15 yards

Every build we ship is zeroed at 15 yards because it gives a carry pistol the most forgiving point of impact from across a room to across a parking lot.

• Close range stays close. At typical defensive distances of 3 to 7 yards, you hit about half an inch to an inch low. That is well inside any vital area.
• Distance stays honest. Out to 50 yards you are within about an inch of the dot, so a longer shot never needs a holdover.
• It is easy to verify. Almost every indoor and outdoor range has a 15-yard line, so you can check your zero anywhere.

Each build ships with its zeroing target and a build card showing the expected point of impact at 5, 10, 15 and 20 yards, so you know exactly what your pistol does before you ever take it to the range.

Iron sights vs. red dots: why sight height changes the answer

The higher your sight sits, the more your zero distance matters. A red dot sits roughly twice as high as iron sights, so it magnifies the differences between zero distances.

• Iron sights sit low enough that almost any zero from 10 to 25 yards keeps you within about half an inch out to 25 yards. Most factory sights are regulated by the manufacturer, and many are set for about 25 yards.
• Red dots sit higher, so a short zero like 7 or 10 yards sends rounds well high at distance. A 15-yard zero cancels most of that out.
• Co-witnessed irons (backup sights visible through the optic) will not match your red dot at every distance, because they sit at a different height. Zero the dot first; treat the irons as a backup for when the dot fails.

How to zero your red dot, step by step

A careful zero should only take about 10 to 20 rounds and under an hour.

1. Check the mount first. Make sure the optic screws are torqued to the manufacturer's spec with thread locker. A loose optic will never hold zero.
2. Use your carry ammo. Different loads hit in different places. Zero with what you actually carry.
3. Start close. Fire a 3-shot group at 5 yards to confirm you are on paper.
4. Move to 15 yards and shoot from a rest. Use a bag or a bench so the group shows the gun, not your grip. Fire a 5-shot group at a small aiming point.
5. Measure from the center of the group, not from any single shot.
6. Adjust. Most pistol red dots move 1 MOA per click, which is about 0.16 inches at 15 yards, so roughly 6 clicks per inch. Turn the elevation and windage adjusters in the direction marked on the optic to move your impact toward the aiming point.
7. Confirm with another 5-shot group. Repeat until the group centers on the dot.
8. Check your offsets. Fire a few rounds at 5, 10 and 25 yards so you know where your gun hits at each distance.

Checking and keeping your zero

A good zero holds for a long time, but check it whenever something changes.

• Switch ammunition: confirm your zero with the new load.
• Remove or replace the optic, or change its battery: re-check the screws and confirm zero.
• Drop or hit the gun: look for movement and confirm zero before you carry it again.
• Otherwise: a quick 5-shot check at 15 yards every few months is plenty for a carry gun.

Between checks, glance at the optic before you carry. Witness marks (a paint line across each screw head) make loose screws easy to spot.

The bottom line

If you carry a red-dot pistol, zero it at 15 yards. You will hit slightly low up close, almost exactly on the dot at the distances that matter, and within an inch out to 50 yards.

If you would rather skip the torque specs, bore sighting and range time, every Charlie Mike Defense carry system arrives with the optic installed to spec and zeroed at 15 yards, with the target in the box. Choose your carry system.