sighting instrument

sighting instrument

[′sīd·iŋ ‚in·strə·mənt]
(ordnance)
A device or an instrument designed to aid in the pointing of a weapon.
References in periodicals archive ?
Although there are a few who use them, a scope is the sighting instrument of choice.
This is a real precision sighting instrument, with click-interval knurled adjustment dials set to quarter-minute-of-angle graduations.