Initial sight settings are those settings that serve as the starting point for initial zeroing from which all sight adjustments are made. If the Marine already has a BZO established on his rifle, he may begin the zeroing process by using the previously established BZO sight settings. To set the sights to initial sight settings:
a. Front Sight Post. To set the front sight post to initial sight setting, depress the front sight detent and rotate the front sight post until the base of the front sight post is flush with the front sight housing.
b. Rear Sight Elevation Knob. To set the elevation knob at the initial sight setting, perform the following:
• Rotate the rear sight elevation knob counterclockwise until the moveable rear sight housing is bottomed out on the upper receiver. See figure 9-9.
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