EOTech LWTS Light Weapon Thermal Sight - Manual (Page 57)

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SECTION IV
ALIGNMENT / ZEROING
2.26 ALIGNMENT / ZEROING PROCEDURES
At 25 yards, each click of the LWTS reticle moves the shot
group about 1.0cm when in WFOV, and 0.5cm when in
NFOV. Changing the position of the reticle corresponds to a
subsequent change in shot group movement (i.e., moving
the reticle up will also move the strike of the round up).
Stand-Alone
When being used as a stand-alone device, the example
below shows how to align the LWTS 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 LWTS / weapon combination
may be zeroed in accordance with established unit,
departmental, or agency procedures.
1. Once mounted to a weapon, the distance from the top of
the rail to the centerline of the LWTS objective lens is
5.8cm. 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 5.8cm + 3.1cm = 8.9cm down from the
center of the target.