SiteLite SL-100 Laser Boresighter

Spend less time getting on paper and more time shooting. The SiteLite SL-100 Mag Laser Boresighter is a professional-quality universal boresighting system designed to quickly align your scope or iron sights before firing the first shot. Unlike cartridge-style boresighters that are caliber-specific and rely on chamber tolerances, the SL-100 uses a powerful magnetic muzzle attachment that precisely centers the laser on the bore axis. The result is a faster, more repeatable boresighting process that works with nearly your entire firearm collection.

Whether you're mounting a new scope, reinstalling an optic after cleaning, replacing rings or bases, or checking zero before hunting season, the SL-100 helps eliminate unnecessary trial-and-error at the range. A properly boresighted rifle typically requires only minor adjustments during final zeroing, saving both ammunition and valuable range time. While a boresighter does not replace live-fire sight-in, it gets you much closer to your desired point of impact before the first shot is fired.

If you are looking for the laser boresight with the longest battery life and the brightest laser, check out the SiteLite SL-500 green laser boresight.  

Magnetic Muzzle Alignment for Superior Accuracy

The biggest advantage of the SiteLite SL-100 is its magnetic alignment system. Instead of inserting a cartridge-shaped laser into the chamber, the SL-100 attaches to the muzzle using powerful rare-earth magnets. Precision adapters and O-rings center the laser within the bore while ensuring that no metal components contact the rifling.

Because the laser references the bore directly rather than the chamber, the SL-100 avoids many of the alignment inconsistencies that can occur with cartridge-style boresighters. This results in improved repeatability when boresighting multiple firearms and makes the system especially useful for shooters who own rifles in several different calibers.

One Boresighter for Nearly Every Firearm

One of the reasons the SL-100 has remained popular for years is its versatility. Instead of purchasing separate laser cartridges for each caliber, one SL-100 works with an enormous variety of firearms.

The system is compatible with:

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

A complete assortment of adapters and O-rings is included, so there are no additional caliber-specific accessories to purchase.

Faster Scope Installation

Mounting a new scope no longer has to begin with guessing where the first shot will land. Simply attach the SL-100 to the muzzle, place the included target approximately 25 feet away, center the laser on the target, and adjust your scope until the crosshairs align with the target's reference marks. The process takes only a few minutes and dramatically reduces the amount of ammunition required to establish a final zero at the range.

The included Sight Alignment Verification System also allows you to record the final relationship between the laser and your scope after zeroing. Before your next hunt or range trip, you can quickly verify that your optic has maintained its zero after transportation or storage without firing a shot.

Built for Years of Use

The SL-100 is precision machined from anodized aircraft-grade aluminum for durability without unnecessary weight. Its magnetic centering system contains no moving mechanical parts that require frequent adjustment, making it a dependable tool for hunters, competitive shooters, law enforcement, and firearm enthusiasts alike.

The laser operates on two included button-cell batteries and provides approximately one hour of continuous operation—more than enough time to boresight multiple firearms in a single session. Everything stores neatly inside the included rugged carrying case to keep the components organized between uses.

What's Included

• SiteLite SL-100 Mag Laser Boresighter
• Complete adapter and O-ring kit
• Scope Reticle Leveler (SRL-100)
• Laser boresighting target
• Sight Alignment Verification Target
• Batteries
• Rugged storage case

Why Choose the SiteLite SL-100?

Many inexpensive laser boresighters are designed around a single caliber and depend on chamber dimensions for alignment. The SiteLite SL-100 takes a different approach by centering itself in the muzzle using a powerful magnetic system. This universal design not only eliminates the need to purchase multiple caliber-specific boresighters, but also provides highly repeatable alignment across a broad range of rifles, handguns, shotguns, and muzzleloaders.

For hunters, recreational shooters, and gunsmiths looking for an accurate, reusable boresighting system that works across nearly every firearm they own, the SiteLite SL-100 remains one of the most practical and cost-effective tools available.