How to Zero a Red Dot in Five Steps

Zeroing a red dot is simple once you understand the math. Here is a five-step process that works for rifles and pistols.

1. Pick your zero distance

For an AR-15 with a red dot, a 50-yard zero is popular. With common 5.56 loads, it keeps you within a few inches of point of aim out to around 200 yards. A 100-yard zero is simpler to confirm and works well for hunting rifles. For pistols, 15 to 25 yards is typical. Check your ammunition's ballistics to see the exact curve.

2. Mount it right and get on paper

Tighten the mount to the maker's torque spec and lock it to the rail. Start at 25 yards. If your rifle allows, look through the bore and line the dot up on the target first. That alone can save a box of ammo.

3. Shoot a group, not a shot

Fire three to five careful shots from a rest. Use the center of the group, not one stray hole, to decide your adjustment.

4. Do the adjustment math

Most red dots move 1 MOA per click, and some move 0.5 MOA. One MOA is about 1.047 inches at 100 yards, so it is about half an inch at 50 yards and a quarter inch at 25 yards. If your group is 2 inches low at 50 yards with 1 MOA clicks, that is roughly 4 clicks up. Remember: adjust in the direction you want the bullet to move, following the arrows on the turret.

5. Confirm at your zero distance

Move to your chosen distance, shoot another group and fine-tune. Then confirm with a final group. Note the zero distance and ammunition on a piece of tape on the stock.

Tips

• Set the brightness so the dot is crisp, not blooming.
• Check zero again after changing ammunition or remounting.
• Witness-mark the mount screws with paint pen so you can spot movement.

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