Chamber the Sightmark® Laser Boresight in your .243, .308 or 7.62x51 rifle like a regular cartridge, and a red laser dot shows exactly where you're aiming.The Sightmark Laser Boresight is a brass in-chamber laser boresight designed for the preliminary alignment of optical, red-dot and mechanical sights
The Sightmark Laser Boresight is a brass in-chamber laser boresight designed for the preliminary alignment of optical, red-dot and mechanical sights. It projects a visible red laser point, has an EU-compliant output of less than 1 mW and provides approximately one hour of operation from three AG3 batteries. Suitable for use Rifles chambered in .243 Winchester Rifles chambered in .308 Winchester Rifles chambered in 7.62×51 NATO Preliminary alignment of newly installed riflescopes Checking sights after installation or transportation Preparing a hunting rifle before live-fire confirmation Reducing the number of cartridges used during initial adjustment Hunters and sport shooters Why choose the Sightmark laser boresight? Fits directly into the rifle chamber Visible red laser with a wavelength of 632–650 nm EU-version output of less than 1 mW Manufacturer-specified sighting range of approximately 14–91 m Approximately one hour of battery life Durable brass body Activated by tightening the battery cap Compact and easy to carry Helps reduce ammunition used during preliminary alignment Batteries and protective carrying pouch included Technical specifications Primary compatibility: .243 Winchester, .308 Winchester and 7.62×51 NATO Additional manufacturer-listed compatibility: 7mm-08 Remington, .260 Remington and .338 Federal Laser type: Visible red laser Wavelength: 632–650 nm Output power: Less than 1 mW Manufacturer-specified sighting range: 15–100 yd / approximately 14–91 m Laser-dot size: Approximately 51 mm at 91 m Recommended preliminary alignment distance: Approximately 18–27 m Power supply: 3 × AG3 batteries Approximate battery life: Up to 1 hour Operation: Threaded on/off battery cap Body material: Brass Operating temperature: –10 to +50 °C Installation: Directly into the rifle chamber Intended use: Preliminary sight alignment and checking Ammunition: No Supplied with Sightmark SM39005EU laser boresight 3 × AG3 batteries Protective carrying pouch Instruction manual Frequently asked questions Is the SM39005EU compatible with 7.62×54R? No. The SM39005EU is intended for .243 Winchester, .308 Winchester, 7.62×51 NATO and other manufacturer-approved cartridges based on the same case family. A dedicated Sightmark SM39037 boresight is required for 7.62×54R. Can a rifle be fully zeroed with this laser boresight? No. The boresight provides a quick reference for aligning the sight with the bore axis, but it does not account for bullet trajectory, ammunition performance or the rifle’s actual point of impact. Final zero must always be confirmed with live ammunition at an authorized shooting range. How should the Sightmark laser boresight be used? Confirm that the firearm is completely unloaded and remove live ammunition from the working area. Install the batteries, place the boresight carefully into the chamber and close the action slowly only until the device sits securely. Align the sight with the laser point and remove the boresight before loading or firing the rifle. In what conditions is the red laser easiest to see? The red laser point is easiest to see indoors, in shade or under reduced lighting. Its visibility can decrease considerably in bright sunlight, so preliminary alignment is usually easier in a controlled-light environment. When is the Sightmark SM39005EU the right choice? This model is a practical choice for owners of .243 Winchester, .308 Winchester or 7.62×51 NATO rifles who want to align a sight with the bore axis before visiting the range. Its cartridge-shaped construction fits directly into a compatible chamber and requires no separate calibre adapter. A universal muzzle-mounted boresight may be more suitable when working with many unrelated calibres. A dedicated model must be selected for 7.62×54R because its rimmed case is dimensionally different. In every case, a laser boresight is a preliminary adjustment tool and does not replace live-fire zero confirmation. Expert recommendation An in-chamber laser boresight is most useful immediately after installing a riflescope, mount or other sighting system. It helps determine whether the adjustment is in the correct general area before the first shot is fired. For a practical initial setup, use a clearly visible target at approximately 18–27 metres and work indoors or in shade whenever possible, as the red laser point can be difficult to see in direct sunlight. Always verify the calibre markings on both the firearm and the boresight before insertion. Bullet diameter alone does not determine compatibility—the chamber and cartridge-case dimensions must also match. Close the action slowly and never force the device into the chamber. After alignment, remove the boresight, take out the batteries for long-term storage and confirm the actual point of impact at a shooting range. Different ammunition loads can produce different impact points even when the rifle and sight settings remain unchanged. Faster preliminary alignment with fewer test shots The Sightmark SM39005EU provides a convenient way to align a compatible .243 Winchester, .308 Winchester or 7.62×51 NATO rifle before live-fire testing. Its brass construction, visible red laser and included batteries make it a practical accessory for hunters and sport shooters.
The Sightmark Laser Boresight is a brass in-chamber laser boresight designed for the preliminary alignment of optical, red-dot and mechanical sights. It projects a visible red laser point, has an EU-compliant output of less than 1 mW and provides approximately one hour of operation from three AG3 batteries. Suitable for use Rifles chambered in .243 Winchester Rifles chambered in .308 Winchester Rifles chambered in 7.62×51 NATO Preliminary alignment of newly installed riflescopes Checking sights after installation or transportation Preparing a hunting rifle before live-fire confirmation Reducing the number of cartridges used during initial adjustment Hunters and sport shooters Why choose the Sightmark laser boresight? Fits directly into the rifle chamber Visible red laser with a wavelength of 632–650 nm EU-version output of less than 1 mW Manufacturer-specified sighting range of approximately 14–91 m Approximately one hour of battery life Durable brass body Activated by tightening the battery cap Compact and easy to carry Helps reduce ammunition used during preliminary alignment Batteries and protective carrying pouch included Technical specifications Primary compatibility: .243 Winchester, .308 Winchester and 7.62×51 NATO Additional manufacturer-listed compatibility: 7mm-08 Remington, .260 Remington and .338 Federal Laser type: Visible red laser Wavelength: 632–650 nm Output power: Less than 1 mW Manufacturer-specified sighting range: 15–100 yd / approximately 14–91 m Laser-dot size: Approximately 51 mm at 91 m Recommended preliminary alignment distance: Approximately 18–27 m Power supply: 3 × AG3 batteries Approximate battery life: Up to 1 hour Operation: Threaded on/off battery cap Body material: Brass Operating temperature: –10 to +50 °C Installation: Directly into the rifle chamber Intended use: Preliminary sight alignment and checking Ammunition: No Supplied with Sightmark SM39005EU laser boresight 3 × AG3 batteries Protective carrying pouch Instruction manual Frequently asked questions Is the SM39005EU compatible with 7.62×54R? No. The SM39005EU is intended for .243 Winchester, .308 Winchester, 7.62×51 NATO and other manufacturer-approved cartridges based on the same case family. A dedicated Sightmark SM39037 boresight is required for 7.62×54R. Can a rifle be fully zeroed with this laser boresight? No. The boresight provides a quick reference for aligning the sight with the bore axis, but it does not account for bullet trajectory, ammunition performance or the rifle’s actual point of impact. Final zero must always be confirmed with live ammunition at an authorized shooting range. How should the Sightmark laser boresight be used? Confirm that the firearm is completely unloaded and remove live ammunition from the working area. Install the batteries, place the boresight carefully into the chamber and close the action slowly only until the device sits securely. Align the sight with the laser point and remove the boresight before loading or firing the rifle. In what conditions is the red laser easiest to see? The red laser point is easiest to see indoors, in shade or under reduced lighting. Its visibility can decrease considerably in bright sunlight, so preliminary alignment is usually easier in a controlled-light environment. When is the Sightmark SM39005EU the right choice? This model is a practical choice for owners of .243 Winchester, .308 Winchester or 7.62×51 NATO rifles who want to align a sight with the bore axis before visiting the range. Its cartridge-shaped construction fits directly into a compatible chamber and requires no separate calibre adapter. A universal muzzle-mounted boresight may be more suitable when working with many unrelated calibres. A dedicated model must be selected for 7.62×54R because its rimmed case is dimensionally different. In every case, a laser boresight is a preliminary adjustment tool and does not replace live-fire zero confirmation. Expert recommendation An in-chamber laser boresight is most useful immediately after installing a riflescope, mount or other sighting system. It helps determine whether the adjustment is in the correct general area before the first shot is fired. For a practical initial setup, use a clearly visible target at approximately 18–27 metres and work indoors or in shade whenever possible, as the red laser point can be difficult to see in direct sunlight. Always verify the calibre markings on both the firearm and the boresight before insertion. Bullet diameter alone does not determine compatibility—the chamber and cartridge-case dimensions must also match. Close the action slowly and never force the device into the chamber. After alignment, remove the boresight, take out the batteries for long-term storage and confirm the actual point of impact at a shooting range. Different ammunition loads can produce different impact points even when the rifle and sight settings remain unchanged. Faster preliminary alignment with fewer test shots The Sightmark SM39005EU provides a convenient way to align a compatible .243 Winchester, .308 Winchester or 7.62×51 NATO rifle before live-fire testing. Its brass construction, visible red laser and included batteries make it a practical accessory for hunters and sport shooters.
