The Sitelite SL-150 Ultra Mag Boresighter is a laser bore-sighting tool built to cut down range trips and ammunition waste before you ever fire a shot. If you've ever spent a box of ammo just getting your scope on paper, you know the value of a quick, accurate zero at home — and that's exactly what this red laser system delivers. The SL-150's ultra-bright 635nm red laser is engineered for visibility even in daylight and bright ambient conditions, making it reliable whether you're sighting in a hunting rifle indoors or in your garage on a sunny afternoon.

Setup is straightforward: position the included laser target 25 feet away, place the boresighter in your bore, and adjust your scope until the crosshairs align with the dot. The cone-shaped aluminum spud is held centered in the bore by a powerful magnet and an O-ring — no special adapters, no metal touching the rifling. It works with rifle scopes and red dot sights equally well, and it'll fit everything from .22 rimfire and centerfire rifles all the way up to .50 caliber big-game and long-range rigs, plus 12 and 20 gauge shotguns. One tool, one system — no drawer full of adapters.

The SL-150 also includes the SRL-100 adapter, which converts the boresighter into a Scope Reticle Leveler. Slip it over the lens, and the refocused laser beam becomes horizontal, letting you dial in precise crosshair alignment — a detail that matters for long-range accuracy and consistency. Whether you're zeroing a new hunting scope, trusting a backup red dot, or verifying level reticles on a precision rifle, this is a tool that pays for itself in saved ammo and time.

The Sitelite SL-150 Ultra Mag Boresighter is a laser bore-sighting tool built to cut down range trips and ammunition waste before you ever fire a shot. If you've ever spent a box of ammo just getting your scope on paper, you know the value of a quick, accurate zero at home — and that's exactly what this red laser system delivers. The SL-150's ultra-bright 635nm red laser is engineered for visibility even in daylight and bright ambient conditions, making it reliable whether you're sighting in a hunting rifle indoors or in your garage on a sunny afternoon.

Setup is straightforward: position the included laser target 25 feet away, place the boresighter in your bore, and adjust your scope until the crosshairs align with the dot. The cone-shaped aluminum spud is held centered in the bore by a powerful magnet and an O-ring — no special adapters, no metal touching the rifling. It works with rifle scopes and red dot sights equally well, and it'll fit everything from .22 rimfire and centerfire rifles all the way up to .50 caliber big-game and long-range rigs, plus 12 and 20 gauge shotguns. One tool, one system — no drawer full of adapters.

The SL-150 also includes the SRL-100 adapter, which converts the boresighter into a Scope Reticle Leveler. Slip it over the lens, and the refocused laser beam becomes horizontal, letting you dial in precise crosshair alignment — a detail that matters for long-range accuracy and consistency. Whether you're zeroing a new hunting scope, trusting a backup red dot, or verifying level reticles on a precision rifle, this is a tool that pays for itself in saved ammo and time.