Heckler&Koch MR556A1 - Manual (Page 9)

16 17
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