boresight

boresight

[′bȯr‚sīt] (ordnance) A telescopic device utilizing a boresighting reticle to align the axis of a weapon with a target; it is attached to the exterior of a weapon barrel or tube by a mount.

boresight

To align a gun or another device by optical sighting on a target. Boresight angle is the angle through which a seeker can pick up and successfully engage a target.