EOTech 556 - Manual (Page 10)

the sight – see figure 8 . The front control is the windage adjustment and the rear control is the elevation
adjustment. Both of the adjustment mechanisms have a slotted head and require the use of a screwdriver,
coin, or spent brass to turn. For both elevation and windage, each click will change the bullet’s point of
impact 1/2 Minute of Angle (MOA) which equals 1/4 inch at 50 yards or 1/2 inch at 100 yards. Also, one full
rotation of 360º of either adjustment control will change the point of impact 10 MOA, 5 inches at 50 yards, or
10 inches at 100 yards. To move the point of impact DOWN, turn the elevation adjustment CLOCKWISE.
To move the point of impact RIGHT, turn the windage adjustment CLOCKWISE.
The elevation and windage adjustments are factory set to coincide with the bore of the rifle parallel to the
mounting rail. The sight should be close to mechanical zero when mounted on a properly installed rail. Do
not change the adjustments before mounting the sight on the firearm. Be sure to check that the mount and
sight are securely mounted after initial firing.
CAUTION – There are 80 minutes of total adjustment range in both windage and elevation (40
minutes in each direction). There are eighty (80)
1 / 2 MOA clicks of adjustment from optical center to
the limits of windage and elevation adjustment. To establish optical/mechanical zero, adjust the
control to it’s travel limit, then return 80 clicks (do this for both the elevation and the windage).
When an increase in resistance in adjustment resistance is encountered, the end of the adjustment
range has been reached. DO NOT turn the adjustment any farther, as serious damage will occur to
the sight.
2.1.7 MPO Shroud
When the 557.AR223 is used as part of the MPO (Multi-Purpose Optic) system, a shroud that fits semi-
permanently to the sight can be installed. The shroud acts as a light shield and dust shield and fits between
the 557.AR223 and the L-3 Eotech 4X Magnifier when the MPO system is fully assembled. The shroud is
made of an elastomer that has three metal retention spring clips. To install the shroud, align it’s flange to
the opening between the hood and the 557.AR223 body as shown in figure 9. Push firmly until the shroud is
fully seated. Removal may damage the spring fingers, necessitating replacement with a new MPO shroud
assembly.
Figure 10 - MPO Shroud Installation