EOTech CNVD-T (SU-232/PAS) Clip-On Night Vision Device - Thermal - Manual (Page 39)

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When being used as a stand-alone device, the example
below shows how to align the CNVD-T2 to be parallel with
the rail of the host weapon on a 25-meter range. This
“infinite parallel” configuration is appropriate for many
mission profiles. Once parallel, the CNVD-T2 / weapon
combination may be zeroed in accordance with established
unit, departmental, or agency procedures.
a. Once mounted to a weapon, the distance from the
top of the rail to the centerline of the CNVD-T
objective lens is 5.9cm. Calculate the designated
strike point by adding this value to the distance from
the center of the weapon barrel to the top of the
weapon rail (3.1cm for an M4/M4A1). Therefore, in
this example, the designated strike point is 5.9cm +
3.1cm = 9.0cm down from the center of the target.
Figure 2-18 Strike Point Calculation
5.9cm