How to Sight In a Scope With a Laser to Hit Paper

The Short Version

• Secure your unloaded rifle: Set your firearm in a firm gun vise or steady sandbags so it cannot move while you make adjustments.
• Insert the laser tool: Slide the barrel laser tool snugly into the muzzle tip or chamber, aiming the beam at a target 25 yards away.
• Match crosshairs to the dot: Remove scope caps and turn your elevation and windage dials until the crosshairs sit directly over the laser dot.
• Finish with live ammo at the range: Remove the laser, head to the shooting range, and fire three-shot groups to adjust for bullet drop and wind.

What a Laser Bore Sight Actually Does

A barrel laser tool shines a straight beam of light down the center of your rifle bore. Laser light travels in a dead-straight line without bending or slowing down. A real bullet behaves very differently. The instant a bullet leaves the muzzle, gravity pulls it downward and air resistance bleeds off its speed. That means a bullet flies along a curved arc, rising toward your sight line before dropping through it.

Because a straight beam of light cannot copy bullet drop, a laser bore tool will never produce a finished zero. Its true purpose is getting your initial shots onto paper on your first trigger pull. When you mount a new optic, the scope tube and the barrel can easily point in different directions. Heading to a 100-yard range without aligning them often means your shots miss the entire target backer, wasting expensive ammunition. The laser projects the center line of the barrel onto a target, giving you a clear guide to align your crosshairs before firing real ammo.

Safety Check and Rifle Bench Setup

Before bringing any alignment tool near your barrel, safe handling comes first. Drop the magazine, pull the bolt back, and look inside the action. Physically place your finger into the chamber to confirm no round is present. Move all live ammunition into another room. Never keep live cartridges near your workspace while working with barrel tools.

Once the firearm is clear, lock it into a steady rest. A gun vise, bench rest, or packed sandbags will keep the rifle still. If your rifle wobbles even slightly, your laser dot wanders across the target wall. That movement tricks you into turning your scope dials to chase a moving beam rather than aligning with the bore.

Take this moment to check your optic mounting screws before turning on any beams. Scope rings that slip under recoil will ruin your work during live firing. Use an inch-pound torque tool (a wrench that tightens bolts to exact pressure limits) to confirm that your base and ring screws meet manufacturer numbers. A drop of thread-locking fluid on screw threads keeps screws from loosening under recoil. If your setup includes backup iron sights, our guide on the best iron sights to cowitness with red dot sights explains how to align both sighting systems cleanly through your glass.

Step-by-Step Scope Alignment With a Laser

Once your rifle is safe and resting firmly, follow these steps to line up your crosshairs with the laser.

1. Set up a target at 25 yards: Place a paper target 25 yards from your bench. This distance keeps the laser dot small and crisp. If working indoors, a long hallway works well. Outdoors, work at dusk or on an overcast day so sunlight does not wash out the beam.
2. Mount the barrel laser tool: If your kit uses muzzle adapters, select the arbor that matches your caliber. Slide the adapter into the barrel opening until it sits flush against the muzzle crown. The fit should feel snug without forcing or scratching the steel. If using a chamber laser, slip the brass cartridge directly into the chamber and close the bolt gently.
3. Aim the laser at the target: Switch the laser on and point the rifle so the beam rests on the paper target center. Lock your bench rest clamps so the firearm stays completely still.
4. Look through the scope glass: Settle behind the rifle with your eye in your natural shooting position. Look through the scope and locate the center crosshairs. On a freshly mounted optic, your crosshairs will likely sit several inches away from the laser beam.
5. Dial the crosshairs to the dot: Remove the caps covering the adjustment dial knobs (also called turrets). The top knob controls elevation (up-and-down), while the side knob controls windage (left-to-right). Turn the knobs until the crosshairs move directly over the laser dot. Turret labels indicate which way a bullet moves on paper during live fire. For instance, turning a dial toward "Up" moves the internal crosshairs downward inside the tube. Turn the dials until the crosshair intersection covers the laser dot.
6. Remove the laser tool immediately: Switch the unit off and remove it from your firearm right away. Slide muzzle adapters straight out without prying against the crown. For chamber units, open the action and remove the brass cartridge. Never leave an alignment tool in your barrel, as firing a round with an obstructed bore causes severe damage and injury.

Muzzle Insert Adapters vs. Cartridge Chamber Lasers

Barrel laser tools generally fall into two categories: muzzle insert kits and brass chamber cartridges. Both styles get your crosshairs on paper, but they attach differently.

Muzzle insert kits slide into the front opening of your barrel using interchangeable expansion adapters. These kits include flexible arbors or rubber sleeves sized to fit barrels from .17 caliber up to 12 gauge shotguns. Their biggest strength is versatility. One kit can align a pocket pistol, a rimfire plinker, a hunting rifle, and a shotgun. However, you must seat the arbor carefully. If the adapter is loose, gravity causes the laser body to droop, throwing off your alignment. You must also slide arbors gently into the barrel tip to avoid scratching the crown. If you shoot handguns alongside long guns, our review of the best red dot sight for Ruger Mark pistols shows how compact optics benefit from universal alignment tools.

Cartridge chamber lasers are machined from solid brass to match the exact dimensions of regular ammunition. You drop the unit into the chamber, and the closed bolt holds it snugly in place. Because chambers are cut to precise factory tolerances, chamber lasers naturally sit straight along the bore line without guesswork. The downside is caliber limitation. A .223 chamber laser only fits rifles chambered in that cartridge. If you own several rifles in different calibers, buying separate brass lasers for each firearm gets expensive quickly.

Taking Your Rifle to the Range for the Final Live-Fire Zero

Aligning your crosshairs with a laser prepares your rifle for the range, but you still need live ammunition for a real zero. Zeroing means adjusting your scope dials so bullets land exactly where your crosshairs point at a set distance.

Start shooting at 25 yards instead of heading straight to 100 yards. The height of your scope above the barrel creates an angle between your vision line and the bore. Shooting at 25 yards ensures your bullet hits paper, giving you an immediate starting point.

Fire a group of three shots at the bullseye using your chosen hunting or target ammunition. Keep your rifle rested steady and focus on a smooth trigger press. Never adjust your scope dials based on a single shot, because a slight flinch can pull one round off center. A three-shot cluster shows your actual center of impact. Measure the distance between your group and the bullseye, then turn your windage and elevation click dials to move the group to center. Most rifle scopes adjust in 1/4 MOA clicks, which means each click moves bullet impact roughly 1/16 inch at 25 yards.

Once your shots punch the center ring at 25 yards, move your target out to your final zero distance, such as 50 yards or 100 yards. Fire another three-shot group to confirm where your bullets land. Because bullets drop over longer distances, you will typically need to turn your elevation dial a few clicks upward to bring the group dead center. Once your shots hit the bullseye, replace your turret caps.

What to Look for in a Laser Bore Sighting Kit

When picking a barrel laser tool to align your optics, focus on features that make setup quick and reliable across your firearm collection.

A multi-caliber kit with a generous supply of labeled adapters gives you the freedom to mount scopes on rifles, handguns, and shotguns without buying extra parts. Look for kits that clearly mark adapter sizes so you can match the sleeve to your bore diameter without guesswork. A snug fit inside the barrel ensures the beam points true along the bore axis.

Beam color also makes a practical difference. Red lasers work well indoors or at dusk, but bright daylight quickly washes out red light against paper targets. Green lasers project a brighter dot that the human eye detects easily, allowing you to see your alignment point outside at 25 yards. Models with built-in rechargeable batteries also save you from buying tiny button-cell watch batteries. Some kits even include a scope bubble level, which helps you square your crosshairs with the rifle receiver before dialing in your adjustments.

1

Visiofire USB Rechargeable Laser Bore Sight Kit : Green Laser

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• ARS Mark

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  9.2
• Brand
  Visiofire

Key specs2

Power System

USB rechargeable internal battery

Caliber Fitting Range

0.17 to 12 Gauge (64 adapters)

Pros & cons32

Pros

• Includes 64 upgraded adapters to fit muzzles from 0.17 up to 12 gauge calibers
• Internal USB rechargeable battery removes the need for spare button cells
• Green laser dot offers distinct daytime visibility when sighting onto paper targets

Cons

• Continuous battery runtime and total recharge time are not specified in the listing
• Long adapter pins require careful insertion into the muzzle crown to prevent bore contact marks

2

CVLIFE 2-in-1 Green Laser Bore Sight with Scope Level Kit

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• ARS Mark

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  9.2
• Brand
  CVLIFE

Key specs2

Scope Leveling Setup

Combines a magnetic base and a 10mm bubble level with a green laser so you can square reticles and align optics out to 200 yards.

Battery Specification

2x CR2 batteries (up to 6 hours)

Pros & cons42

Pros

• Integrates a magnetic scope level and 10mm bubble level to level crosshairs during mounting
• High-accuracy green laser projects an alignment reference up to 200 yards
• Aircraft-grade aluminum housing with hard-anodized finish protects against bumps
• Two included CR2 batteries deliver up to 6 hours of continuous operating time

Cons

• Uses non-rechargeable CR2 batteries rather than integrated USB charging
• Weighs over 1 pound with accessories, making it heavier than bare bore sighting units

3

USB Rechargeable Bore Sight Laser, 64 Adapters Professional Green Laser

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  9.0
• Brand
  Despwolf

Key specs1

Rechargeable Setup

Recharges directly via USB to project a green alignment dot across 0.17 to 12 gauge muzzles without buying disposable coin cells.

Pros & cons32

Pros

• USB rechargeable battery eliminates the hassle and ongoing cost of button cells
• Includes 64 adapters to support barrel diameters from 0.17 caliber to 12 gauge
• Bright green laser aids scope crosshair alignment across rifles, pistols, and shotguns

Cons

• Single-charge battery runtime is omitted and must be verified before long range sessions
• Requires access to a USB power source when the internal battery runs low

4

Bore Sight Laser Professional Green Laser Bore Sight Kit with

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  9.0
• Brand
  moloxo

Key specs1

Adapter Selection

32 adapters (0.17 to 12GA)

Pros & cons32

Pros

• Bright green laser diode stands out clearly against targets in varied lighting
• Supplied with 32 caliber adapters fitting bores from 0.17 up to 12 gauge
• Compact adapter selection simplifies finding common rifle and handgun calibers

Cons

• Fewer adapter increments than 64-piece kits may result in a looser fit in certain bores
• Listing does not specify the battery power source or operating runtime

5

UUQ Professional Laser Bore Sight Kit with Button Switch,Red Laser

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  9.0
• Brand
  UUQ

Key specs2

Switch Mechanism

Push-button power switch

Beam Color

Red laser diode

Pros & cons32

Pros

• Push-button switch provides instant manual power control without twisting the unit
• Accommodates 0.17 to 12 gauge barrels across 32 included caliber adapters
• Fits diverse platforms including airsoft, rifles, pistols, and shotguns

Cons

• Red laser beam provides lower daylight contrast than green laser options
• Battery type and operating runtime are not stated in the product details

6

CVLIFE Professional Laser Bore Sight Kit with 32 Adapters fit

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• ARS Mark

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  8.8
• Brand
  CVLIFE

Key specs1

Laser Diode Type

Red laser with button switch

Pros & cons32

Pros

• Easy push-button switch turns the red laser on and off without removing end caps
• Includes 32 adapters to align optics on calibers from 0.17 up to 12 gauge
• Red diode configuration draws less power than comparable green laser units

Cons

• Red dot can be difficult to see on paper targets in bright outdoor sunshine
• Expected battery lifespan and battery cell model are not listed

7

CVLIFE Professional Laser Bore Sight Kit with 32 Adapters fit

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  8.8
• Brand
  CVLIFE

Key specs1

Target Contrast

Uses a green laser diode controlled by a push-button switch, giving higher visibility against paper targets before firing live rounds.

Pros & cons32

Pros

• High-visibility green laser dot projects clearly onto targets during initial scope alignment
• Push-button power switch avoids battery drain during storage and setup pauses
• Includes 32 adapters covering standard calibers from 0.17 to 12 gauge

Cons

• Listing does not specify the required battery model or continuous runtime
• Supplies fewer adapter diameter sizes than 64-piece kits for niche calibers

8

CVLIFE Rechargeable Bore Sight Laser Kit with 64 Adapters fit

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• ARS Mark

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  8.8
• Brand
  CVLIFE

Key specs1

Bore Fit Versatility

Supplies 64 separate adapters to fit calibers between 0.17 and 12 gauge closely, paired with a rechargeable battery and push-button switch.

Pros & cons42

Pros

• Rechargeable battery system removes the need to buy disposable replacement cells
• Large 64-adapter assortment provides tight sizing steps from 0.17 to 12 gauge
• Instant push-button switch simplifies beam control while turning scope turrets
• Green laser beam ensures solid contrast against paper targets at indoor distances

Cons

• Charging time and total continuous runtime per charge are omitted in the specs
• Cannot quickly swap in standard alkaline cells if the charge depletes at the bench

9

EZshoot Bore Sight Kit Bright Red Dot Laser BoreSighter with

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  8.6
• Brand
  EZshoot

Key specs1

Switch Operation

Features a prominent button switch that allows instant activation without removing end caps or handling tiny switches.

Pros & cons32

Pros

• Large push-button switch offers smooth activation even while wearing range gloves
• Accommodates wide barrel profiles ranging from .17 caliber up to 12 gauge
• Compact bore tool aligns scope reticles onto paper before live ammunition fire

Cons

• Total number of included caliber adapters is not specified in the listing
• Red laser dot is less visible against bright outdoor backgrounds than green lasers

10

OWLSHOOT Rechargeable Bore Sight Laser Kit: Green Laser Boresighter with

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  8.6
• Brand
  OWLSHOOT

Key specs3

Battery and Runtime

17 hours runtime (2-hour USB recharge)

Visible Range

15 to 300 yards (Class IIIA <5mW)

Warranty Protection

2-year manufacturer warranty

Pros & cons42

Pros

• Built-in lithium battery charges in 2 hours and provides up to 17 hours of runtime
• Includes 50 serialized adapters with anti-slip texture for fast barrel matching
• Class IIIA green laser provides 15 to 300 yards of visible range in varied light
• Aluminum body comes with a portable storage case and 2-year manufacturer warranty

Cons

• Storage case measures 8.86 by 6.89 inches, requiring more bag space than bare tools
• Kit contains 50 adapter sizes rather than 64, leaving fewer micro-fit options

Last update on 2026-10-02 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

FAQs

Why does my bullet hit a different spot than the laser dot?

A laser beam travels perfectly straight, while a real bullet drops through the air from gravity. Your scope also sits an inch or two above the barrel, creating an angled line of sight that intersects the bullet path. Wind, bullet weight, and barrel vibration also pull your shots away from the laser beam.

How far away should my target be when using a laser bore sight?

The best distance for laser bore alignment is 25 yards. At 25 yards, the laser dot stays small and sharp so you can center your crosshairs directly over it. Setting up farther away makes the dot fuzzy and harder to see while magnifying any slight adapter alignment errors.

Which way do I turn the scope dials to move the crosshairs to the laser dot?

Turn the adjustment dials in the direction that moves your crosshairs toward the laser dot on the paper. Turret markings indicate where live bullets move on the target. If your crosshair sits above the laser dot, turning your dial toward "Up" moves the crosshairs downward to meet the beam.

What should I do if the laser dot moves when I spin the tool in the barrel?

If the laser dot traces a circle when you twist the tool in your barrel, the adapter is seated unevenly. Pull the tool out, inspect the rubber sleeve for grit, and select a slightly tighter fitting adapter. When properly centered, rotating the tool should keep the dot stationary on your target.