How to Use a Feyachi 9Mm Bore Sight to Zero Your Red Dot Without Wasting Ammo

Getting a new red dot zeroed used to mean burning through a box or two of ammunition, chasing your point of impact downrange with each adjustment. A laser bore sight changes that equation entirely. With a quality 9mm bore sight, you can get your optic on paper and close to zeroed before you fire a single round — saving money, range time, and frustration.

In this guide, we'll walk through exactly how to use the 9mm bore sight to zero your red dot the smart way, with a complete step-by-step process that works for pistols, pistol-caliber carbines, and AR-15 platform builds.

Why Bore Sighting Matters

A bore sight is a small laser device — typically shaped like a cartridge — that projects a laser beam down your barrel from the chamber. Because the laser emanates from the bore itself, it gives you a true reference point for where your barrel is pointing. Your optic should then be aligned to that point.

Zeroing from a bore-sighted starting point typically gets you within a few inches of a true zero at common defensive distances. That means instead of 40 rounds of trial and error, you might need just a handful to confirm and fine-tune. Hunters and competitive shooters have relied on this trick for decades, and if you want a deeper dive on the technique, this overview of a Laser Bore Sight Tool covers the fundamentals well.

The math is simple: ammo is expensive, range trips take time, and a bore sight pays for itself the first time you skip a wasted zeroing session.

What You'll Need

• A Feyachi bore sight laser 9mm (includes batteries)
• Your firearm, cleared and double-checked
• Your red dot optic, properly mounted
• A target at 10–25 yards (a wall or backyard backstop works for the initial alignment)
• A stable rest — sandbags, a bench, or a solid grip stance

If you're still shopping for an optic, pairing your bore sight session with an ar15 red dot with magnifier combo is a great move — the 1x red dot handles close work while the magnifier extends your effective zeroing and shooting distance.

Step-by-Step: Zeroing Your Red Dot with a 9mm Bore Sight

Step 1: Confirm Your Firearm Is Unloaded

This is non-negotiable. Remove the magazine, lock the slide or bolt open, and physically and visually inspect the chamber. Do this twice. Bore sighting happens in your home or garage, so treat every firearm as loaded until proven otherwise.

Step 2: Install the Bore Sight

With the action open, insert the 9mm bore sight into the chamber as you would a live round — the laser should activate on contact (most Feyachi units use a simple on/off cap or contact activation). Close the action gently and let the laser project onto your target surface. You should see a clear red dot at your target distance.

Pro tip: set your target at 10–15 yards for the initial alignment. That's close enough to see the laser crisply and far enough to make optic adjustments meaningful.

Step 3: Align Your Red Dot to the Laser

Now, without moving the firearm, adjust your red dot's turrets so the dot sits directly on top of the laser point:

1. Look through your optic while the firearm is rested and stable.
2. Note where the red dot sits relative to the laser dot.
3. Turn your elevation and windage turrets until the optic's dot is centered on the laser.

Remember the rule: move the dot in the direction you want your point of impact to shift. If the laser is left of your dot, adjust windage left.

Because the sight line sits above the bore, the laser and dot won't perfectly overlap at all distances — that's normal. Align them at your chosen reference distance and you'll be close at everything inside 25 yards. For a helpful perspective on what bore sighting can and can't do, this review of a Site-Rite 9mm Laser Bore Sighter is worth a read.

Step 4: Remove the Bore Sight and Head to the Range

Open the action, remove the bore sight, and store it safely. Your optic is now roughly zeroed. Load up and head to the range for live-fire confirmation.

Step 5: Confirm at the Range

Set a target at your preferred zero distance — 15 or 25 yards is typical for a 9mm pistol or PCC. Fire a three-to-five shot group from a rest. Your group should land close to your point of aim already. Make final turret adjustments based on the group's center, then fire another group to confirm.

Most shooters go from bore sight to confirmed zero in 5–10 rounds. Compare that to the 40+ rounds of blind zeroing, and the value is obvious.

Common Mistakes to Avoid

• Forgetting parallax: Align your eye consistently behind the optic. Head position changes can shift your perceived point of aim.
• Skipping the live-fire confirmation: A bore sight gets you close, never exact. Always confirm with real ammo.
• Working on an unstable platform: Rest the firearm on sandbags or a bench for the alignment step. Freehand alignment introduces error.
• Mixing up turrets: Elevation is the top turret (up/down), windage is the side turret (left/right). Double-check before turning.
• Leaving the batteries in: Remove the batteries after each use so your bore sight is ready next time.

Other Ways a Bore Sight Pays Off

Once you own one, you'll find more uses than you expect:

• Re-zeroing after optic removal: Took your red dot off for cleaning or travel? Bore sight gets you back on paper instantly.
• Checking multiple firearms: A 9mm bore sight works across any 9mm pistol or carbine in your collection.
• Verifying mount tightness: If your optic has shifted after a bump or drop, a quick bore sight check reveals it before you burn ammo.
• Low-light setup: Pair your zeroing session with a feyachi flashlight mounted on your pistol or PCC and confirm your dot is visible against your light's beam pattern at night — a smart check for home-defense setups.

Does Bore Sighting Work for Longer Distances?

Yes, with caveats. A 9mm bore sight is calibrated for 9mm trajectory, and 9mm drops noticeably past 50 yards. For pistol-caliber use, zeroing at 25 yards is the sweet spot. If you're running a magnified setup on a PCC, your ar15 red dot with magnifier combo benefits the most from bore sighting, since re-zeroing a magnifier combo after removal is tedious without a laser reference.

For a broader comparison of available options before you buy, this roundup of the 5 Best 9mm Laser Bore Sight models breaks down accuracy, battery life, and fit.

Frequently Asked Questions About Bore Sighting

How accurate is a 9mm bore sight?

A properly used bore sight typically gets you within 2–4 inches of zero at 25 yards. It's a starting point, not a final zero — always confirm with live fire.

Can I bore sight in my house?

Yes, and it's one of the biggest advantages. With the firearm confirmed unloaded, you can align your optic against a wall or basement backstop. Just make sure the laser has a safe backstop and never point it at eyes or reflective surfaces.

Will a 9mm bore sight fit all my 9mm firearms?

Cartridge-style laser bore sights are chambered for 9mm Luger, so they work in any 9mm pistol or 9mm carbine. Verify the caliber marking before purchasing.

How long do bore sight batteries last?

Most units run 1–2 hours of continuous use on included batteries. Turn the laser off when not actively aligning to extend battery life.

Final Thoughts

Zeroing a red dot doesn't need to be an ammo-draining guessing game. A bore sight laser 9mm turns a 40-round session into a 5-round confirmation, and it keeps paying off every time you swap optics or re-mount your red dot. Pick one up, follow the steps above, and get your dot where it belongs — on target, the first time.

Ready to grab one at a discount? Head to our Feyachi discount code page for the current offer of 10% off all orders before you check out.