Heckler&Koch MR762A1 - Manual (Page 8)

14 15
SECTION 4 — SIGHTS, SIGHT ADjUSTMENT, AND AIMING
HK DIOPTER SIGHTS
MR762A1 rifles can accommodate a wide variety of optical and mechanical (iron) sights.
For models with HK Diopter rotary sight sets, the sights are installed on the MIL-STD-
1913 (Picatinny) rail with a Phillips #2 screwdriver or the HK sight tool (Fig. 5 & 6). Do not
over tighten the screws.
Fig. 5 – Front Diopter Sight Fig. 6 – Rear Diopter Sight
For optimal sight use and the longest sight radius, the front sight is installed on the
most forward portion of the MIL-STD-1913 rail and the rear sight is installed on the
most rearward portion of the MIL-STD-1913 rail (located on the upper receiver). Sight
adjustment is as follows:
1. Place target 100 meters (109.3 yards) downrange
2. Rotate rear drum until the 100 meter setting (“1”) is visible to the shooter
3. Utilizing the HK sight adjustment tool and the acronym LLC (Low Left Clockwise);
adjust the strike of the round until point of aim (POA) equals point of impact (POI).
Any corrections which may be required when sighting-in the weapon may only be
performed by adjusting the rear sight for elevation or windage. MR rifles are designed to
be sighted in at a range of 100 meters.
ELEvATION ADjUSTMENT
Insert elevation adjustment tool into the rear sight cylinder so that the wedges of the
tool engage in the two slots in the cylinder which contain the catch bolts. Press Phillips-
head screwdriver downward into the adjustment tool and hold firmly. Rotate rear sight
cylinder manually in the desired direction (Fig. 7). After correction withdraw Phillips-head
screwdriver and remove elevation adjustment tool. The catch bolts will then re-engage in
the slots. After performing the elevation adjustment set the desired aperture again.
NOTE: Elevation: One 1/4 click of the drum will move the strike of the road
approximately 1.5” (3.8cm) @ 100 meters. One 360 degree rotation of the drum will
move the strike of the road approximately 6” (15.2cm) @ 100 meters.
Fig. 7 – Rear Sight Adjustment
Fig. 8 – Clamping Screw Fig. 9 – Windage Adjustment
(to tighten turn clockwise)
WINDAGE ADjUSTMENT
Point of impact, left: Loosen clamping screw on top of sight base (Fig. 8). Turn adjusting
screw on the right side counterclockwise (Fig. 9) in accordance with the required
correction. Then retighten clamping screw. This will move the impact to the Right.
Point of impact, right: Loosen clamping screw (Fig. 8). Turn adjusting screw clockwise
(Fig. 9) until the required correction has been performed. Then retighten clamping screw.
This will move the impact to the Left.
NOTE: Windage: One 360 degree rotation of the windage screw will move the strike
of the road approximately 6” (15.2cm) @ 100 meters.
TROY ACCESSORY SIGHTS
Some MR762A1 rifles are supplied with Troy Industries Micro Folding Sights. Aiming and
sight picture are similar to using the HK diopter sights covered in the section above.
Fig. 10 – Installing front TROY sight Fig. 11 – Tightening front TROY sight
INSTALLING TROY ACCESSORY SIGHTS (FRONT)
1. Unscrew clamping assembly and place the sights at the desired location on the
Picatinny rail (Fig. 10.
2. Apply one drop of tread locking compound to the exposed threads of the clamping
screw. Replace the clamping plate and tighten the clamping screw while pushing
sight forward against the cross-slot (Fig. 11). To raise the sight, grasp and pull up
until the sights locks in the upright position. To fold the sight, depress the button on
the left side of the base and fold down (Fig. 12, Fig. 13).