TM 9-1005-319-23&P 0019
0019-12
TEST AND INSPECTION
8
1 4
2 2
2 1
1 3
1 v s 1 6 3
2 0
Figure 13. Zeroing Elevation Knob.
1. Rotate and test elevation index (13) and windage knob (8) for ease of functioning.
2. Inspect elevation knob zero as follows:
a. Rotate elevation knob (22) counterclockwise until the rear sight assembly is all the way down. If a
whole click is not felt as the rear sight assembly stops, the rear sight assembly has bottomed out
and will not pivot freely.
b. Position elevation knob (22) back slightly to its last whole click so the rear sight base is under
tension of ball bearing (21) and helical spring (20). The 300 meter mark should align with mark on
left side of upper receiver.
c. If 300 meter mark is not aligned with mark on receiver, slip range scale in the following manner:
(1) Position 300 meter mark with mark on receiver.
(2) Insert a 1/16 in. key wrench through access hole of rear sight base and into index screw (14).
(3) Loosen index screw (14) three turns and leave wrench in place.
(4) Rotate lower portion of elevation knob (22) counterclockwise until it stops (range scale should
not have moved). Elevation knob should be positioned on its last whole click.
(5) Tighten index screw (14) and remove wrench.
(6) Check for proper setting.
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