SIG SAUER SIG556xi - Manual (Page 23)

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front sight elevation adjustment
elevation adjustments are made to the front sight upon initial zeroing of the rifle. an M16a2/
M4 type front sight tool can be used to make sight adjustments.
rotating the front sight post clockwise lowers the front sight post resulting in the impact of the
bullet to move upward on the target.
rotating the front sight counterclockwise raises the front sight post resulting in the impact of
the bullet to move downward on the target.