gunsight
nounUK /ˈɡʌnsaɪt/
US /ˈɡʌnsaɪt/
A small part on a gun that helps you aim it at a target.
The soldier looked through the gunsight to aim at the target.
OTHER MEANINGS
2. A device on a weapon used to help line up a shot accurately.
He adjusted the gunsight before firing.
3. A small marker or notch on a firearm used for aiming.
The front gunsight was slightly bent.
4. An optical instrument attached to a gun for precise aiming.
The rifle had a telescopic gunsight mounted on top.