EOTech ATPIAL (AN/PEQ-15) - ADVANCED TARGET POINTER ILLUMINATOR AIMING LIGHT - Manual (Page 37)

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2.6 ZEROING PROCEDURES (Continued)
7. Fire a 3-round shot group and note the center of the shot
group relative to the designated strike point. Re-tighten
the rail grabber bracket.
8. Rotate the Aim Laser adjusters to move the center of the
shot group to the designated strike point.
9. Fire another 3-round shot group and again observe the
center of the new shot group relative to the designated
strike point.
10. When 5 out of 6 consecutive rounds are in the
designated strike zone, the ATPIAL / weapon
combination is zeroed.
11. Once the aiming beams are zeroed, rotate the Mode
Selector to the DL (DUAL LOW) or DH (DUAL HIGH)
position to observe both the IR aiming and illumination
beams. Rotate the Illuminator adjusters to center the
illumination beam over the IR aiming beam.