Letter: S

The height to which a rear sight is set to zero-in the firearm for any specific range.

A device that increases the distance between the sights.

Metal or plastic discs with either apertures or posts for use in globe front sights.

The vertical portion of a metallic rear sight containing the notch.

The visual image observed by the shooter when the firearm sights are properly aligned on the point-of-aim.

The distance between the rear sight and the front sight on a firearm.

A sight base having a sloping rear surface on which a front or rear sight may be mounted.

The procedure of adjusting the sights so as to bring the point of impact to coincide with the point of aim.

Shot(s) fired to determine point of impact.

A firing mechanism in which the trigger serves the sole purpose of releasing the firing mechanism – either hammer or striker. For differentiation: See Double Action. See Double Action Only.