It’s a Night vision device for reflexive night vision and aiming fire of individual weapons using ambient light (moonlight or starlight) for illumination.
The AN/PVS-4 Individual Weapon Night Sight is a portable, battery operated, electro-optical instrument used for observation and aimed fire of weapons at night. It amplifies reflected light such as moonlight, starlight, and sky glow so that the viewed scene becomes clearly visible to the operator. The sight does not emit visible or infrared light (except from the eyepiece) that can be detected by the enemy. It can be used with the M16 rifle, M249 and M60 machine guns, and 83mm MK183 MOD 1 (SMAW) rocket.
The AN/PVS-4 is a second generation image intensification device. This sight comes furnished with mounting brackets for the M16 and M60, reticules and mounting brackets for use with other weapons must be separately requisitioned. A carrying bag and battery adapter for low temperature operations may also be requisitioned.
I like it's housed in a metal body and cushioned within silicon rubber,Bright & Tough Night Sights feature a unique shock- resistant design that is patented by Trijicon.Each lamp is capped with a sapphire jewel to help evenly distribute the light while protecting the lamp from solvents and puncture.
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