The optical sight is made from a solid piece of glass so there's
no risk of nitrogen leaking and subsequent fogging in the field.
It has two complementary reticle patterns for differing lighting
A day reticle, which is projected into the sight from the front,
features a circular reticle which provides very rapid target
acquisition throughout the effective range of the weapon.
The reticle has several markings which complement each other.
A very large circular reticle provides fast target acquisition at
panic-close range, while a much smaller circle is optimized for
target acquisition at 100 meters but works very well at closer
ranges. A tiny dot inside the smallest circle can be used for
maximum finesse; this dot lies 3.7 inches (94 mm) above the
center of the bore.
A low-light reticle, which is illuminated by a replaceable tritium
cell, is projected into the optical sight from the rear. It is normally
invisible in bright daylight conditions unless the sight is shaded
by the brim of a large hat. A horizontal reticle runs across the
center of the field from one side to the other, and a vertical reticle
runs from the bottom of the field to the small circle. These lines
form three legs of a traditional crosshair reticle, which can be quite
useful inside dark buildings or during low-light operations outside.
In those relatively rare lighting conditions where both the day and
night reticles are visible, the sight picture is still uncluttered enough
to provide rapid target acquisition.