The Firefield FF39012 is a red laser boresight designed for rifles chambered in .243 Winchester, .308 Winchester and 7.62×51 NATO. It fits directly into the chamber and helps align a riflescope, red-dot sight or iron sights with the bore axis before live firing, reducing the time and ammunition required during initial zeroing. Suitable for use Preliminary alignment of a .243 Winchester rifle Preliminary alignment of a .308 Winchester rifle Preliminary alignment of a 7.62×51 NATO rifle Aligning a newly installed riflescope Initial adjustment of a red-dot sight or iron sights Realignment after removing and reinstalling an optic Checking alignment after firearm maintenance Helping place the first live rounds on the target Use at a shooting range or in a safe maintenance area Why choose the Firefield FF39012 boresight? Compatible with .243 Win, .308 Win and 7.62×51 NATO chambers Fits directly into the firearm’s chamber Visible red laser Laser wavelength of 632–650 nm Output power below 5 mW Recommended sighting range of approximately 14–91 m Approximately 51 mm dot at 91 m Durable brass construction Compact and easy to carry Powered by two AG5 or three AG3 batteries Approximately one hour of battery life Two AG5 batteries included Helps reduce ammunition use during preliminary alignment Technical specifications Compatible calibres: .243 Winchester, .308 Winchester and 7.62×51 NATO Not compatible with: 7.62×54R Installation: Directly into the chamber Laser type: Visible red laser Laser wavelength: 632–650 nm Output power: Less than 5 mW Recommended sighting range: Approximately 14–91 m Dot size: Approximately 51 mm at 91 m Power supply: Two AG5 or three AG3 batteries Included batteries: Two AG5 batteries Battery life: Approximately 1 hour Operation: On/off end cap Construction: Brass Operating temperature: Approximately –9 to +49 °C UPC: 812495021077 Ammunition: No Laser device: Yes Supplied with Firefield FF39012 laser boresight Two AG5 batteries Manufacturer’s packaging Frequently asked questions Which calibres are compatible with the Firefield FF39012? The boresight is intended for .243 Winchester, .308 Winchester and 7.62×51 NATO chambers. Always confirm the calibre marked on the firearm and the product packaging before inserting the device. Is the FF39012 compatible with 7.62×54R? No. The 7.62×54 marking shown in the title of one Firefield webpage is misleading. The manufacturer’s technical-file name specifies 7.62×51, while the 7.62×54R case has different dimensions and geometry. Never force the boresight into an incompatible chamber. Can this laser boresight provide a final zero? No. The device indicates the bore axis and is intended only for preliminary sight alignment. Actual bullet impact is affected by ammunition, sight height, barrel characteristics and shooting distance. The final zero must be confirmed with live ammunition at an appropriate shooting range. How should the FF39012 be used safely? Confirm that the firearm is unloaded and keep all live ammunition away from the work area. Maintain a safe muzzle direction and never direct the laser toward anyone’s eyes. Remove the boresight from the chamber before loading or firing the firearm. When is the Firefield FF39012 the right choice? The FF39012 is suitable for users who need to align a sight on a rifle chambered in .243 Winchester, .308 Winchester or 7.62×51 NATO. Its cartridge-shaped brass body fits directly into the chamber and does not require a muzzle-mounted calibre adapter. Choose the Firefield FF39011 for .30-06 Springfield. A separate, clearly marked device is required for 7.62×54R. A universal boresight may be more economical when several unrelated calibres are regularly used. The red laser performs best indoors or in shade, as visibility may be limited in bright sunlight. Expert recommendation The Firefield FF39012 is most useful after installing an optic, servicing the rifle or remounting a sight. Its purpose is to bring the sight sufficiently close to the bore axis that the first live rounds should reach the target. The red laser is easiest to see in a dim room or on a shaded range, and the rifle should remain on a stable support throughout the adjustment. Always verify the exact chambering before use. Insert the FF39012 without force and do not close the action aggressively against it. After preliminary alignment, remove the device, inspect the chamber and complete the final zero with suitable ammunition. Remove the batteries before long-term storage to reduce the risk of discharge or leakage. The laser beam must never be directed toward the eyes of people or animals. Faster preliminary alignment for common rifle calibres The Firefield FF39012 provides a straightforward way to align the sights of rifles chambered in .243 Win, .308 Win and 7.62×51 NATO before live firing. Its brass construction, visible red laser and included batteries make it a practical tool for hunters and target shooters.
The Firefield FF39012 is a red laser boresight designed for rifles chambered in .243 Winchester, .308 Winchester and 7.62×51 NATO. It fits directly into the chamber and helps align a riflescope, red-dot sight or iron sights with the bore axis before live firing, reducing the time and ammunition required during initial zeroing. Suitable for use Preliminary alignment of a .243 Winchester rifle Preliminary alignment of a .308 Winchester rifle Preliminary alignment of a 7.62×51 NATO rifle Aligning a newly installed riflescope Initial adjustment of a red-dot sight or iron sights Realignment after removing and reinstalling an optic Checking alignment after firearm maintenance Helping place the first live rounds on the target Use at a shooting range or in a safe maintenance area Why choose the Firefield FF39012 boresight? Compatible with .243 Win, .308 Win and 7.62×51 NATO chambers Fits directly into the firearm’s chamber Visible red laser Laser wavelength of 632–650 nm Output power below 5 mW Recommended sighting range of approximately 14–91 m Approximately 51 mm dot at 91 m Durable brass construction Compact and easy to carry Powered by two AG5 or three AG3 batteries Approximately one hour of battery life Two AG5 batteries included Helps reduce ammunition use during preliminary alignment Technical specifications Compatible calibres: .243 Winchester, .308 Winchester and 7.62×51 NATO Not compatible with: 7.62×54R Installation: Directly into the chamber Laser type: Visible red laser Laser wavelength: 632–650 nm Output power: Less than 5 mW Recommended sighting range: Approximately 14–91 m Dot size: Approximately 51 mm at 91 m Power supply: Two AG5 or three AG3 batteries Included batteries: Two AG5 batteries Battery life: Approximately 1 hour Operation: On/off end cap Construction: Brass Operating temperature: Approximately –9 to +49 °C UPC: 812495021077 Ammunition: No Laser device: Yes Supplied with Firefield FF39012 laser boresight Two AG5 batteries Manufacturer’s packaging Frequently asked questions Which calibres are compatible with the Firefield FF39012? The boresight is intended for .243 Winchester, .308 Winchester and 7.62×51 NATO chambers. Always confirm the calibre marked on the firearm and the product packaging before inserting the device. Is the FF39012 compatible with 7.62×54R? No. The 7.62×54 marking shown in the title of one Firefield webpage is misleading. The manufacturer’s technical-file name specifies 7.62×51, while the 7.62×54R case has different dimensions and geometry. Never force the boresight into an incompatible chamber. Can this laser boresight provide a final zero? No. The device indicates the bore axis and is intended only for preliminary sight alignment. Actual bullet impact is affected by ammunition, sight height, barrel characteristics and shooting distance. The final zero must be confirmed with live ammunition at an appropriate shooting range. How should the FF39012 be used safely? Confirm that the firearm is unloaded and keep all live ammunition away from the work area. Maintain a safe muzzle direction and never direct the laser toward anyone’s eyes. Remove the boresight from the chamber before loading or firing the firearm. When is the Firefield FF39012 the right choice? The FF39012 is suitable for users who need to align a sight on a rifle chambered in .243 Winchester, .308 Winchester or 7.62×51 NATO. Its cartridge-shaped brass body fits directly into the chamber and does not require a muzzle-mounted calibre adapter. Choose the Firefield FF39011 for .30-06 Springfield. A separate, clearly marked device is required for 7.62×54R. A universal boresight may be more economical when several unrelated calibres are regularly used. The red laser performs best indoors or in shade, as visibility may be limited in bright sunlight. Expert recommendation The Firefield FF39012 is most useful after installing an optic, servicing the rifle or remounting a sight. Its purpose is to bring the sight sufficiently close to the bore axis that the first live rounds should reach the target. The red laser is easiest to see in a dim room or on a shaded range, and the rifle should remain on a stable support throughout the adjustment. Always verify the exact chambering before use. Insert the FF39012 without force and do not close the action aggressively against it. After preliminary alignment, remove the device, inspect the chamber and complete the final zero with suitable ammunition. Remove the batteries before long-term storage to reduce the risk of discharge or leakage. The laser beam must never be directed toward the eyes of people or animals. Faster preliminary alignment for common rifle calibres The Firefield FF39012 provides a straightforward way to align the sights of rifles chambered in .243 Win, .308 Win and 7.62×51 NATO before live firing. Its brass construction, visible red laser and included batteries make it a practical tool for hunters and target shooters.
