M16A1 rear sight apertures and windage drum. Adjustments for windage are made by pressing in on the spring-loaded detent with a sharp instrument (or the tip of a cartridge) and rotating the windage drum in the desired direction of change (right or left) in the strike of the bullet.įigure 3-23. The aperture marked L is used for ranges beyond 300 meters, and the unmarked or short-range aperture is used for ranges up to 300 meters. The rear sight consists of two apertures and a windage drum with a spring-loaded detent (Figure 3-23). Windage adjustments are made on the rear sight elevation adjustments on the front sight. The sights are adjustable for both elevation and windage. (A somewhat higher hit probability results with minor adjustments to the aiming point.) Targets can be hit out to a range of 300 meters with no adjustments to point of aim. It reaches its highest point above the line of sight (about 5 inches) at a range of about 175 meters, crosses line of sight again at 250 meters, and is about 7 inches below line of sight at 300 meters. At 25 meters, the bullet is about 1 inch below line of sight, crossing line of sight at 42 meters. Most combat targets are expected to be engaged in the ranges from 0 to 300 meters therefore, the 250-meter battlesight zero is the setting that remains on the rifle.
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