Heckler&Koch MR556A1 User Manual

Page 9

Fig. 12 – Folding (lowering) Fig. 13 – Lowered sight

TROY front sight TROY front sights

INSTALLING TROY REAR SIGHTS

1. The rear TROY sight installs similar to the front sights. Unscrew clamping assembly

and place the sights at the desired location on the Picatinny rail.

2. To raise the sight, grasp and pull up until the sights locks in the upright position. To

fold (lower) the sight, depress the button on the left side of the base and fold down.

(Fig. 14-16)

Fig. 14 – Rear Sight Fig. 15 – Lowering

Fig. 16 – Rear sight

Rear Sight

folded (lowered)

FRONT SIGHT ADjUSTMENT ZEROING

1. Fire a group of four (4) shots and measure the average distance for point-of -aim to

point-of-impact.

2. Adjust front sight for elevation only.

3.Windage adjustments are made with the rear sight.

4. Confirm zero with a group of four aimed shots and adjust is necessary

Fig. 17 – Front sight adjustment Fig. 18 – Using a bullet tip

to adjust the front sight

FRONT SIGHT ADjUSTMENT
To move the bullet impact up, turn the adjustment wheel to the right/clockwise (Fig. 17

& 18). To move the bullet impact down, turn the adjustment wheel to the left/counter

clockwise (Fig. 18 & 19).

Fig. 19 – Rear Sight Fig. 20 – Windage adjustment

REAR SIGHT ADjUSTMENT
Windage adjustment can be made by inserting a pointed object (like a bullet tip) or a flat

object (like a screwdriver or coin) into the coin slot and turning the adjustment wheel. To

move the bullet impact right, turn the adjustment wheel to the right/clockwise. To move

the bullet impact left, turn the adjustment wheel to the left /counter clockwise (Fig. 19 &

20).

Fig. 21 – Rear Sight Fig. 22 – Changing aperture

The Troy rear sight also offers a choice of two flip-style apertures, both large and small

(Fig. 22). The large aperture is for close engagement and the small aperture is for more

distant shooting. Generally the large aperture works best for alignment with the front sight

and for short and medium ranges. Elevation does not change when switching apertures.

For long range shots, the small aperture can be flipped into position by finger pressure on

the top of the rear sight.

value for 1 click of adjustment Troy Micro Sights

100 meters 200 meters 300 meters

M4/HK416/MR556A1 sight radius

.50 MOA

5/8”

1-1/8”

1-5/8”

INSTALLING THE OPTIONAL HK FLIP-UP FRONT SIGHT
Press front sight onto front sight holder until the axes holes of front sight and front sight

holder are aligned. Push through front sight axles all the way, from the right to the left and

secure the front sight axles by snapping the retaining clip. Check function of foldable front

sight (Fig. 23 & 24).

Fig. 23 Fig. 24