Notched rear sights use a notch in the blade mounted perpendicular to the barrel. While horizontal alignment is basically the same for most iron sights, vertical alignment depends on the shape of the rear sight. This involves both horizontal alignment and vertical alignment. Sight alignment involves aligning the front blade in the opening of the rear sights. Using iron sights requires the shooter to first obtain the proper sight alignment and then the correct sight picture. The top of the front blade is centered in the circle formed by the rear sight. An aperture rear sight is a ring or a hole in the rear sight. By aligning the rear sight and front sight, the gun can be very accurately aimed out to the limit of the shooters vision. Typically, a vertical blade at the muzzle end of the barrel and the rear sight with an opening in the center mounted near the base of the barrel. To improve accuracy over the single bead sight, iron sights were developed. From simple sights designed to be used inside 25 yards, to optical sights accurate at 1000 yards. As technology has improved, so have gun sights. To improve accuracy, gun sights were developed. From the beginning of the age of firearms, it became clear that looking down the barrel was not an adequate solution. Aiming a gun is basically learning how to accurately point the gun at the target you want to hit.
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