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With tangent sights, the rear sight is often used to adjust the elevation, and the front the windage. The M16A2 later M16 series rifles have a dial adjustable range calibrated rear sight, and use an elevation adjustable front sight to "zero" the rifle at a given range. The rear sight is used for windage adjustment and to change the zero range.
The greatest adjustment of focus (relatively more ocular muscle contraction) is required to view shorter distances, such as the gun's rear sight. In the modern technique, the shooter is taught to focus on the front sight of the pistol and align it against the target, ignoring the rear sight for quicker aiming and minimal physical requirements.
These circle targets are especially suitable for peep sights, aperture sights, dot reticles, and bead front sights; and are most useful when the apparent diameter of that sight feature matches the apparent diameter of the contrasting circle at the selected distance to target. Firearms with blade front sights and notch rear sights may reduce ...
On both the standard and target models, the front post sight height is fixed and can be drifted for windage adjustments. The rear sight on the standard model is raised square notch type. The standard model had non-adjustable sights, but the rear sight on the target model had an extension at the rear of the frame for an adjustable target rear sight.
Rear, rotating diopter drum sight of a SIG SG 550 service rifle.The viewing aperture above the "3" (denoting the 300 m setting) can be seen. The diopter is in principle a vertically and horizontally (elevation and windage) adjustable occluder with a small hole (aperture), and is placed close in front of the shooter's aiming eye.
The rear sight is marked in 100 meter increments from 100 to 1,000 meters. The rear sight is adjusted for windage using a knob on the left side of the rear sight. Because the front sight of the RPD must be partially disassembled in order to adjust windage, in practice the front sight would have been zeroed for windage and then locked in place.