Assertion: iron sight | /r/ObjectUse | used as sighting device
Facets:
Source sentences:
text: Iron sights are a system of shaped alignment markers (usually metal) used as a sighting device to assist in the aiming of a device such as a firearm, crossbow, or telescope, and exclude the use of optics as in reflector (reflex) sights, holographic sights, and telescopic sights.