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The Site-Lite SL-100 laser boresighter is a time-tested tool for shooters who want to dial in their scopes without burning through ammunition at the range. Instead of fire-forming rounds downrange to zero, you set up this laser system indoors at a safe distance, align your optics to the laser dot, and arrive at the range already on target. It works with red dot scopes, iron sights, and traditional rifle scopes across nearly every caliber you're likely to own.
The system is straightforward: place the special laser target 25 feet away, mount the boresighter's aluminum cone into your bore using an O-ring and magnet, and adjust your scope's crosshairs to match the laser dot. No special adapters required—the universal design handles everything from .22 rimfire and .50 BMG to 12- and 20-gauge shotguns with one simple kit. The magnet and O-ring hold the cone centered without letting metal touch the rifling, so there's zero risk of bore damage.
The SL-100 is the standard model, designed for indoor use where you control the lighting. If you're working in bright sunlight or outdoors and need better laser visibility, Site-Lite also makes the SL-150 (red 635mm laser) and SL-500 (green laser) versions. The kit also includes the SRL-100 adapter, which converts the boresighter into a scope reticle leveler by refocusing the laser into a horizontal beam for checking crosshair alignment—a handy bonus for precision shooters.
Whether you're hunting, practicing long-range, or just keeping your rifles ready to go, a laser boresighter saves ammo, shortens your range session, and gets you close enough that your first shots count. For shooters managing multiple firearms or those new to scope zeroing, it's a smart investment in efficiency and confidence.
Key Features
- Laser-based bore alignment eliminates guesswork before heading to the range
- Universal design fits .22 to .50 caliber rifles and 12/20-gauge shotguns with one kit
- Aluminum cone with magnet and O-ring mounting—no bore contact, no risk of damage
- Works with red dot scopes, iron sights, and traditional rifle scopes
- Includes SRL-100 scope reticle leveler adapter for precise crosshair alignment
- Indoor-rated model; best used in controlled lighting conditions
Specifications
| Model | Site-Lite SL-100 |
| Laser Type | Standard red laser |
| Compatibility | .22 to .50 caliber rifles; 12 and 20-gauge shotguns |
| Mounting | O-ring and magnet bore mount; universal adapter system |
| Included Accessories | SRL-100 scope reticle leveler adapter |
| Use Case | Indoor zeroing and scope alignment |
Frequently Asked Questions
What's the difference between the SL-100, SL-150, and SL-500 laser boresighters?
The SL-100 uses a standard red laser and is best for indoor use with controlled lighting. The SL-150 features a brighter red 635mm laser for better visibility in ambient light. The SL-500 uses a super-bright green laser for maximum visibility in bright daylight and high ambient light conditions. All three share the same universal bore-mount design and adapter system.
Will this boresighter work with my rifle scope, red dot, and shotgun?
Yes. The Site-Lite SL-100 works with red dot scopes, iron sights, traditional rifle scopes, and shotguns. One universal kit with adapter rings and O-rings fits calibers from .22 rimfire through .50 BMG, as well as 12- and 20-gauge shotguns.
Does the boresighter damage the bore or rifling?
No. The aluminum cone is held in the bore by a magnet and O-ring—no metal contacts the rifling, so there's no risk of bore damage or scarring.
What is the SRL-100 adapter included with the boresighter?
The SRL-100 is a scope reticle leveler adapter. It slips over the boresighter's lens and refocuses the laser into a horizontal beam, letting you check that your scope's crosshairs are level for precision alignment.
