boresight

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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

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.