18001 SiteLite SL-100 Mag Laser Professional Boresighter

SiteLite SL-100 Magnetic Laser Boresighter

The SiteLite SL-100 Mag Laser Professional Boresighter is a reusable laser boresighting system designed to help align a scope or iron sights before firing. Rather than inserting a laser cartridge into the chamber, the SL-100 attaches magnetically at the muzzle. Its adapter and O-ring system helps center the laser along the bore, providing a practical starting point for sight alignment across a range of firearms.

Use the SL-100 when installing a new scope, changing scope rings or bases, reinstalling an optic, or checking alignment before a hunting season or range session. Boresighting reduces the guesswork involved in getting on paper, but final zero must still be confirmed with live ammunition.

Firearm Compatibility

• .22 through .50 caliber rifles
• .22 through .50 caliber handguns
• 12 gauge and 20 gauge shotguns
• Most muzzleloaders

The included adapter and O-ring kit accommodates supported applications. For replacement parts, select the appropriate option for your firearm and boresighter setup.

How to Use the SL-100

1. Select the appropriate adapter and O-ring setup for the firearm.
2. Attach the boresighter securely at the muzzle, following the manufacturer's instructions.
3. Position the target at approximately 25 feet and activate the laser.
4. Adjust the scope or sights to align with the target's reference marks.
5. Confirm and refine the zero at the range with live fire.

The included Sight Alignment Verification System helps you record the relationship between the laser and your sight alignment after zeroing. It can also help you check alignment again after transporting or storing your firearm.

SL-100 Features and Included Accessories

• Magnetic muzzle attachment: Holds the boresighter at the muzzle rather than placing a laser cartridge in the chamber.
• Aluminum body: Anodized aircraft-grade aluminum construction.
• Scope reticle leveler: The included SRL-100 helps level a scope reticle during setup. See the SiteLite SRL-100 Scope Reticle Leveler.
• Targets and storage: Includes a laser boresighting target, a Sight Alignment Verification Target and a carrying case.
• Batteries included: Uses two button-cell batteries and provides approximately one hour of continuous operation, according to the product specifications.

The package includes the SiteLite SL-100 boresighter, adapter and O-ring kit, SRL-100 scope reticle leveler, targets, batteries and storage case.

Replacement O-Rings and Accessories

Need replacement O-rings for a specific caliber or application? Browse our SiteLite replacement O-rings by size and select the appropriate size-specific pack.

If you want a multi-size assortment instead, see the separate SiteLite SL-ORINGSET replacement O-ring set. The individual replacement packs and the SL-ORINGSET assortment are different products.

Comparing the SiteLite SL-100, SL-150 and SL-500

The SL-100 is the entry model in SiteLite's magnetic laser boresighter lineup. If you're considering a different model, compare its features with the SiteLite SL-150 Ultra Mag Laser Professional Boresighter and the SiteLite SL-500 Ultra Mag Green Laser Professional Boresighter.

Our guide to SiteLite SL-100 vs. SL-150 vs. SL-500 explains the differences between these three models to help you choose the right boresighter.

For additional information about laser visibility and boresighting performance, read our guide to laser boresight accuracy and the SiteLite SL-500. You can also browse our complete SiteLite product selection.

Confirm Your Zero at the Range

A laser boresighter helps bring your sights or optic close to the point of impact before firing; it does not replace confirming zero with live ammunition. Follow the firearm and boresighter manufacturers' safety instructions, and ensure the firearm is unloaded before installing or removing the device.