How to Zero Your AR-15 at 25 Meters — The Military Method

Published by Alco Target Company  |  alcotarget.com  |  626-358-4814

If you've ever watched a soldier or Marine zero their rifle at a military range, you've seen the 25-meter zero in action. It's the most efficient, most practical, and most battle-tested zeroing method for the AR-15 platform — and it works equally well for law enforcement officers, competitive shooters, and civilian AR-15 owners who want a reliable, accurate zero without needing a 300-yard range.

This guide covers everything you need to know about the 25-meter zero — what it is, why the military uses it, how to do it step by step, and what target to use. By the end you'll understand exactly why one well-placed group at 25 meters gives you a confirmed zero at 300 meters — and how to dial your AR-15 in fast, efficiently, and correctly.

What Is the 25-Meter Zero?

The 25-meter zero is a zeroing method used by the United States Army, Marine Corps, and law enforcement agencies nationwide. It is based on the ballistic properties of the 5.56mm/.223 round — specifically the fact that the bullet's trajectory crosses the line of sight at two points: once close to the muzzle and once downrange.

When you zero an AR-15 at 25 meters, the bullet's path will also intersect with your line of sight at approximately 300 meters. This means a 25-meter zero gives you a functional 300-meter zero — without ever needing to shoot at 300 meters to confirm it.

For law enforcement officers, military personnel, and civilian AR-15 owners who may not have access to a 300-yard range, the 25-meter zero is the answer. Most indoor ranges, backyard ranges, and short-distance outdoor facilities can accommodate 25 meters — making this zeroing method universally accessible.

Why Does the Military Use the 25-Meter Zero?

1. Ballistic Efficiency

The 5.56mm NATO round fired from an M4 or AR-15 with a standard 14.5" or 16" barrel has a specific trajectory that makes the 25-meter/300-meter dual zero mathematically accurate. The bullet rises slightly above line of sight after leaving the muzzle, crosses the line of sight at 25 meters, arcs slightly above the line of sight at midrange, and comes back down to cross the line of sight again at approximately 300 meters.

2. Range Accessibility

Not every military installation or training facility has a 300-meter range. But virtually every facility has a 25-meter range. By using the 25-meter zero, military armorers and range personnel can zero hundreds of rifles quickly and efficiently without needing extended range distances.

3. Speed and Efficiency

Zeroing at 25 meters is fast. A properly trained shooter can confirm a zero in 2-3 groups — often in under 10 minutes. Compare that to the time required to zero at 100 or 300 meters with multiple position changes, target walks, and extended range sessions.

4. Consistency and Standardization

The military zeroing standard is documented in field manuals and applied consistently across all services and installations. Every soldier and Marine zeros to the same standard — which means unit armorers, range officers, and commanders know exactly what to expect from a properly zeroed rifle.

What You Need to Zero Your AR-15 at 25 Meters

• Your AR-15 — M4, M16, M16A2, M16A4, or any AR-15 variant
• Ammunition — M193 55gr FMJ or M855 62gr FMJ for best results
• AR Zero Target — the official military 25-meter zeroing target (SKU: AR-0 at alcotarget.com)
• Stable shooting platform — bench rest, sandbags, or bipod for initial zeroing
• Screwdriver or adjustment tool — for iron sight adjustments
• Pen or marker — to mark your groups on the target
• Spotting scope or binoculars — helpful but not required at 25 meters

Understanding the AR Zero Target

The AR Zero target is not just any paper target — it is a specifically designed zeroing aid that takes the guesswork out of the 25-meter zero process.

Offset Aiming Point

The AR Zero target features a specific aiming point that accounts for the offset between your barrel bore and your sighting system. Because iron sights and optics sit above the bore axis — typically 2.5" to 2.6" for M4/AR-15 irons — the aiming point on the zeroing target is offset to compensate. When your group lands on the designated zero point, your rifle is correctly zeroed.

Grid Reference Points

The target includes grid reference points that allow you to measure exactly how far your group needs to move to reach zero — and calculate exactly how many clicks of adjustment are needed on your sights or optic.

Multiple Zeroing Boxes

The target includes multiple zeroing boxes so you can fire multiple groups and track your adjustments without constantly changing targets.

Step-by-Step: How to Zero Your AR-15 at 25 Meters

Step 1 — Set Up Your Target Correctly

Place your AR Zero target at exactly 25 meters (approximately 27.3 yards). Accuracy of target distance matters — a target placed at 23 or 27 meters will produce a different result than one placed at exactly 25 meters. Use a tape measure if your range does not have marked 25-meter firing points. Mount the target so the center is at approximately shoulder height when standing.

Step 2 — Establish a Stable Shooting Position

For initial zeroing, use the most stable platform available — a bench rest with sandbags is ideal. The goal during zeroing is to eliminate as much shooter error as possible so that your group location reflects only the mechanical zero of your rifle, not shooter technique.

Step 3 — Fire Your First 3-Round Group

Aim at the designated aiming point on your AR Zero target. Fire a deliberate 3-round group, taking your time with each shot. Focus on a consistent trigger press, natural point of aim, and consistent cheek weld. Mark this group with a pen or marker when you approach the target.

Step 4 — Measure Your Group

Measure the center of your group relative to the zero point on the target using the grid lines. You need two measurements:

• Vertical offset — how many inches high or low your group is from zero
• Horizontal offset — how many inches left or right your group is from zero

Step 5 — Calculate Your Adjustment

At 25 meters, most AR-15 iron sights and optics adjust at a rate of 1 MOA per click or 1/2 MOA per click. One MOA at 25 meters equals approximately 0.26 inches.

Step 6 — Make Your Adjustments

Make your calculated adjustments to your iron sights or optic. Always adjust your sights in the direction you want your bullet impact to move — if your shots are low, move the elevation adjustment UP. If shots are right, move windage LEFT.

Step 7 — Fire a Confirmation Group

Fire another 3-round group at the same aiming point. Measure the new group location. If it is on zero — you are done. If further adjustment is needed, repeat Steps 4-6 until your group lands on the zero point.

Step 8 — Fire a Final Confirmation Group

Once your group is on zero, fire one final 3-round confirmation group to verify your zero is solid and repeatable. A zero is not confirmed until you have a repeatable group landing on the zero point across multiple strings of fire.

Common Zeroing Mistakes — And How to Avoid Them

Mistake 1 — Using an Incorrect Target

Using a standard bullseye or silhouette target for a 25-meter zero will produce incorrect results unless you account for bore offset manually. Use the AR Zero target — it has the bore offset calculation built into the aiming point.

Mistake 2 — Inconsistent Shooting Position

If your position changes between shots your group will open up and your zero will be unreliable. Establish a consistent position and maintain it throughout the zeroing process.

Mistake 3 — Moving the Wrong Direction

Adjust your sights in the direction you want your bullet to move. If shots are low move the elevation UP. If shots are right move the windage LEFT.

Mistake 4 — Adjusting After One Shot

Always fire a group — minimum 3 rounds — before making adjustments. A single shot tells you almost nothing because of natural variation.

Mistake 5 — Not Recording Your Zero

Once you achieve zero, record your sight settings. Write down the number of clicks from mechanical zero for both elevation and windage so you can return to zero quickly if the sights are bumped.

Mistake 6 — Switching Ammunition

Different ammunition has different ballistics. Zero your rifle with the exact ammunition you plan to train and carry with — and re-confirm your zero any time you change ammunition types.

25-Meter Zero vs. Other Zeroing Methods

Expected Impact at Distance with a 25-Meter Zero

Shop AR Zero Targets at Alco Target

Alco Target Company has been producing professional shooting targets for law enforcement agencies, military training programs, and serious shooters since 1964. Our AR Zero target is the same military-format 25-meter zeroing target used at ranges across the country — printed at our Duarte, California facility on 8.5" x 11" paper in packs of 100.

Shop the AR Zero target and our complete lineup of paper targets, law enforcement qualification targets, and specialty training targets at alcotarget.com or call us at 626-358-4814.

About Alco Target Company

Alco Target Company is a family-owned shooting target manufacturer based in Duarte, California. Founded in 1964 by Long Beach Police Officer Al Evanson and purchased in 1985 by Wayne Semain, Alco Target has been producing professional-grade paper, cardboard, and steel shooting targets for over 60 years. We are an officially licensed NRA, USPSA, IPSC, and IDPA target supplier.

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