The EOTech rifle sight is an aiming device designed to allow shooters to quickly acquire targets and fire with both eyes open. This is because the way the sight reticle appears to be superimposed on the target. Like any sight, you must first zero the sight to match the bullet's point of impact out of the barrel. Once zeroed, the sight is capable of providing accurate sighting to at least 300 yards.
Prepare a stable shooting platform. You may use a seated or prone position, but the rifle needs to be stably supported.
Set up a paper target exactly 25 yards down range of your shooting platform. Zeroing the EOTech at 25 yards will give you an accurate aim point out to 300 yards.
Ensure the sight is set to mechanical zero. Both the windage and elevation adjustments contain 160 clicks total. Rotate the adjusting screw all the way in one direction, and then rotate it back the other direction, counting 80 clicks. Repeat for the other adjusting screw.
Load three rounds into the weapon, and assume a supported firing position. Aim at the center of the target and slowly fire the three rounds. It doesn't matter where the rounds strike the target. The goal is to have all three rounds hit as close together as possible.
Render the weapon safe and check your target. Determine the average strike location of the rounds. For example, if the three rounds form a triangle, the average strike location would be the center of the triangle. If the rounds are too far apart, you will not get an accurate reading. Try to group the rounds within a radius of no more than about three inches.
Measure from the average strike location, left or right to the imaginary center line of the target running from top to bottom, and record the measurement. Measure from the average strike location, up or down to the imaginary line running from left to right, and record the measurement. Place a small piece of tape over each bullet hole.
Determine how many clicks you need to rotate each adjusting screw to move the impact of the bullets to the center of the target. At 25 yards, each click moves the point of impact 1/8 inch. To move the point of impact one inch, turn the screw eight clicks.
Adjust the elevation by rotating the screw closest to the rear of the sight clockwise to move the point of impact down and counterclockwise to move it up.
Adjust the windage by turning the screw closest to the front of the sight clockwise to move the point of impact to the right and counterclockwise to move it left.
Fire an additional three rounds and check the target. Make any necessary adjustments to the windage and elevation screws. Continue in this fashion until the point of impact is approximately 1/2 inch below the point of aim, which is the center of the target.
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