The Armson O.E.G. is a red-dot gunsight that requires no batteries; it uses a small fiber optic rod to gather light. The O.E.G. has been around since the 1980’s, and is now being imported by Armson U.S.A.
The O.E.G., or “Occluded Eye Gunsight” uses the brain’s ability to “blend” two images- it superimposes the red dot on the object you are looking at. This requires that both eyes remain open, which most shooters agree is tactically better at closer ranges.
The O.E.G. is extremely rugged, meets all military standards, and is available with mounts for the M16, H&K, FN-FAL, Mini-14, and others. For those who distrust battery-operated sights, the Armson is a reliable alternative.