sight notch

The user simply centers the front sight in the rear sight notch.

I let the front sight ride up in the rear sight notch and tried again, keeping my fire well away from Hartford.

The post or bead is placed in the rear sight notch, and the target is placed above and centered on the aligned sights.

White outline rear: A contrast variation which uses a dot front sight with a thick and bright white outline around the rear sight notch.

Traditionally, cruiser compasses featured a sighting notch, a mechanically-damped or "dry" needle, adjustable declination and a large dial marked in individual degrees using counterclockwise calibration (reversed east and west positions).

Three-dot: On semi-automatic handguns, the most common type of enhancement is a bright white dot painted on the front sight near the top of the blade, and a dot on each side of the rear sight notch.

For nighttime use, the R4 is equipped with self-luminous tritium light dots (exposed after placing the rear sight in an intermediate position) installed in a pivoting bar to the front sight base, which folds up in front of the standard post and aligns with two dots in the rear sight notch.