SIG SAUER SIG556xi - Manual (Page 24)

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buis installation on the sig556xi
The Sig556xi is equipped with the Sig BuiS. This rear sight offers a rapid adjustment for range and an additional knob for wind-
age. it also allows for a battesight zero to be set by the operator.
to install:
1. The sight must be mounted in the second to last slot of the top M1913 rail.
2. Set the sight in the rail slot with the windage knob to the right/range scale to the left.
3. Pull the sight back rearward in the slot until it stops.
4. Tighten the retaining screw until snug then an additional ¼ turn using an 1/8” hex wrench.
to Zero the buis:
use an M4 25m zero target at a known distance of 25m:
1. Turn the range knob to 300m (do not use the fine line between 300 and 400
as this is for a rifle length sight radius).
2. fire a three round shot group.
3. correct elevation with the front sight post.
4. correct windage with the windage knob on the BuiS
5. re-fire another 3 round group and make corrections.