The sighting system of the M16A2 service rifle consists of a front sight post and two rear sight apertures.
a. Front Sight. The front sight post is used to adjust for elevation. The front sight consists of a square, rotating sight post with a four-position, spring-loaded detent (see figure 9-2). To adjust for elevation, use a pointed instrument (or the tip of a cartridge) to depress the detent and rotate the front sight post (see figure 9-3).
• To raise the strike of the bullet, rotate the post clockwise (in the direction of the arrow marked UP) or to the right.
• To lower the strike of the bullet, rotate the post counterclockwise (in the opposite direction of the arrow) or to the left.
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