bore sight

bore sight (plural bore sights)

1. (firearms) An optical device, mounted on or near the end of a firearm's barrel, used to align the sights with the bore.
2. (firearms) A dummy cartridge containing a small battery-operated laser, used to align the sights.

bore sight (third-person singular simple present bore sights, present participle bore sighting, simple past and past participle bore sighted)

1. (firearms) To align the sights and aiming point of a firearm using a bore sight optical tool.

• Bore sighting is similar to, but not as accurate as, zeroing, which normally involves adjustments made to a sight after firing at a target.