A military term for aligning a gun barrel or weapon with its sighting system to ensure accurate targeting.
Compound of 'bore' (the interior of a gun barrel, from Old English) and 'sight' (from Old English 'gesihþ'), combining the gun's internal passage with visual alignment.
Boresighting is why snipers spend hours aligning their scopes before taking shots—a millimeter of misalignment at the gun can mean missing a target by yards at distance, following the geometry of diverging lines.
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