The Firefield laser bore sight is an in-chamber laser boresight designed for firearms chambered in .223 Remington and 5.56×45 NATO.
The Firefield laser bore sight is an in-chamber laser boresight designed for firearms chambered in .223 Remington and 5.56×45 NATO. Its brass housing and 632–650 nm red laser help provide an initial alignment for a riflescope, red-dot sight or iron sights before final live-fire zeroing. Suitable for use Initial sight alignment on .223 Remington firearms Initial sight alignment on 5.56×45 NATO firearms Checking a newly installed riflescope Aligning a red-dot or reflex sight Preliminary adjustment of iron sights Checking sight alignment before visiting the range Hunters, target shooters and firearm owners Keeping as a compact calibre-specific tool in a range bag Why choose the Firefield FF39016? Compatible with .223 Remington and 5.56×45 NATO chambers Installs directly into the firearm’s chamber Visible 632–650 nm red laser Manufacturer-specified sighting range of 15–100 yards Approximately 2-inch laser dot at 100 yards Durable brass construction Simple on/off end-cap operation Approximately one hour of battery life Two AG5 batteries included Compact and easy to transport Helps reduce the time and ammunition required for initial sight adjustment Technical specifications Compatible calibres: .223 Remington and 5.56×45 NATO Laser colour: Red Laser wavelength: 632–650 nm Laser output: Less than 5 mW Sighting range: 15–100 yd / approximately 14–91 m Dot size: 2 in at 100 yd / approximately 51 mm at 91 m Power supply: 2 × AG5 or 3 × AG3 batteries Battery life: Approximately 1 hour Operation: On/off end cap Body material: Brass Operating temperature: Approximately –9 to +49 °C Intended use: Preliminary sight alignment Ammunition status: Not ammunition or a snap cap Supplied with Firefield FF39016 laser boresight 2 × AG5 batteries Frequently asked questions Is the Firefield FF39016 compatible with both .223 Remington and 5.56×45 NATO? Yes. The manufacturer specifies compatibility with firearms chambered for either calibre. This refers only to the fit of the boresight and does not mean that .223 Remington and 5.56 NATO ammunition is interchangeable in every firearm. Can this laser boresight produce a final zero? No. It indicates the approximate direction of the bore and is intended for preliminary sight alignment. The final zero must always be confirmed with suitable ammunition at an authorised shooting range. Is the laser boresight live ammunition? No. It is a battery-powered alignment tool without a bullet, propellant or primer. It must be removed from the chamber before the firearm is loaded or fired. Is the red laser visible in daylight? Visibility depends on ambient light, background colour and distance. The red dot is easiest to see indoors, in shade or in reduced light, while its practical range may be shorter in bright sunlight. When is the Firefield FF39016 the right choice? This model is a practical option for shooters who primarily use a firearm chambered in .223 Remington or 5.56×45 NATO and want a compact tool for preliminary sight alignment. Its calibre-specific body fits directly into the chamber and does not require a mandrel or adaptor to be inserted into the muzzle. A universal muzzle-mounted boresight may be more economical when several unrelated calibres need to be checked. The FF39016 does not replace final range verification because the actual point of impact is affected by ammunition, distance, barrel characteristics and environmental conditions. Expert recommendation An in-chamber laser boresight is particularly useful after installing or replacing a riflescope or red-dot sight. It helps bring the sight’s initial setting closer to the bore axis before visiting the range, reducing the number of large corrections normally required during final zeroing. A stable firearm support and a shaded or dimly lit target area will make the red laser dot easier to observe. Always confirm that the firearm is unloaded and remove all live ammunition from the work area before inserting the device. Do not force the boresight into the chamber or close the action aggressively against it. Remove it before loading or firing, keep the laser away from eyes and people, and remove the batteries before long-term storage to reduce the risk of discharge or leakage. Faster preliminary alignment before range verification The Firefield FF39016 provides a simple way to pre-align the sights of a .223 Remington or 5.56×45 NATO firearm. Its calibre-specific fit, brass construction and compact design make it a useful addition to a shooter’s maintenance and range kit.
The Firefield laser bore sight is an in-chamber laser boresight designed for firearms chambered in .223 Remington and 5.56×45 NATO. Its brass housing and 632–650 nm red laser help provide an initial alignment for a riflescope, red-dot sight or iron sights before final live-fire zeroing. Suitable for use Initial sight alignment on .223 Remington firearms Initial sight alignment on 5.56×45 NATO firearms Checking a newly installed riflescope Aligning a red-dot or reflex sight Preliminary adjustment of iron sights Checking sight alignment before visiting the range Hunters, target shooters and firearm owners Keeping as a compact calibre-specific tool in a range bag Why choose the Firefield FF39016? Compatible with .223 Remington and 5.56×45 NATO chambers Installs directly into the firearm’s chamber Visible 632–650 nm red laser Manufacturer-specified sighting range of 15–100 yards Approximately 2-inch laser dot at 100 yards Durable brass construction Simple on/off end-cap operation Approximately one hour of battery life Two AG5 batteries included Compact and easy to transport Helps reduce the time and ammunition required for initial sight adjustment Technical specifications Compatible calibres: .223 Remington and 5.56×45 NATO Laser colour: Red Laser wavelength: 632–650 nm Laser output: Less than 5 mW Sighting range: 15–100 yd / approximately 14–91 m Dot size: 2 in at 100 yd / approximately 51 mm at 91 m Power supply: 2 × AG5 or 3 × AG3 batteries Battery life: Approximately 1 hour Operation: On/off end cap Body material: Brass Operating temperature: Approximately –9 to +49 °C Intended use: Preliminary sight alignment Ammunition status: Not ammunition or a snap cap Supplied with Firefield FF39016 laser boresight 2 × AG5 batteries Frequently asked questions Is the Firefield FF39016 compatible with both .223 Remington and 5.56×45 NATO? Yes. The manufacturer specifies compatibility with firearms chambered for either calibre. This refers only to the fit of the boresight and does not mean that .223 Remington and 5.56 NATO ammunition is interchangeable in every firearm. Can this laser boresight produce a final zero? No. It indicates the approximate direction of the bore and is intended for preliminary sight alignment. The final zero must always be confirmed with suitable ammunition at an authorised shooting range. Is the laser boresight live ammunition? No. It is a battery-powered alignment tool without a bullet, propellant or primer. It must be removed from the chamber before the firearm is loaded or fired. Is the red laser visible in daylight? Visibility depends on ambient light, background colour and distance. The red dot is easiest to see indoors, in shade or in reduced light, while its practical range may be shorter in bright sunlight. When is the Firefield FF39016 the right choice? This model is a practical option for shooters who primarily use a firearm chambered in .223 Remington or 5.56×45 NATO and want a compact tool for preliminary sight alignment. Its calibre-specific body fits directly into the chamber and does not require a mandrel or adaptor to be inserted into the muzzle. A universal muzzle-mounted boresight may be more economical when several unrelated calibres need to be checked. The FF39016 does not replace final range verification because the actual point of impact is affected by ammunition, distance, barrel characteristics and environmental conditions. Expert recommendation An in-chamber laser boresight is particularly useful after installing or replacing a riflescope or red-dot sight. It helps bring the sight’s initial setting closer to the bore axis before visiting the range, reducing the number of large corrections normally required during final zeroing. A stable firearm support and a shaded or dimly lit target area will make the red laser dot easier to observe. Always confirm that the firearm is unloaded and remove all live ammunition from the work area before inserting the device. Do not force the boresight into the chamber or close the action aggressively against it. Remove it before loading or firing, keep the laser away from eyes and people, and remove the batteries before long-term storage to reduce the risk of discharge or leakage. Faster preliminary alignment before range verification The Firefield FF39016 provides a simple way to pre-align the sights of a .223 Remington or 5.56×45 NATO firearm. Its calibre-specific fit, brass construction and compact design make it a useful addition to a shooter’s maintenance and range kit.
