I commonly adjust the sights throughout a match. When you go from the 50 meter line to the 200 meter line in a silhouette match, you need to adjust. Lighting conditions will create a need to adjust sights, "Light up-sight up, light down-sight down." Even going from the slow fire stage at 50 yards to the timed-rapid at 25; I need to adjust my sights. Even different ammo will create a need to adjust.
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