A weapon will be zeroed, either at the factory or by the user.
This process involves aligning the sights properly with the location the bullet will be at a certain distance.
A gun can only be zeroed for one specific distance at a time, and to aim precisely, the zero must be adjusted for different ranges.
While the sight may be a few inches above the bore axis, at a hundred yards (a typical zero distance) this can be compensated for by a slight adjustment of angle.
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