The Alpha Optics AO-4248/4348 Night Vision Weapon Sights are constructed from a rugged aluminum housing which provides durability and dependable boresight retention as well as the lowest possible weight to the sights. This device provides an excellent observation, target acquisition and aiming capabilities at night. The Sights have a high light cut-off capability and can operate at extreme temperatures. The AO-4248/4348 incorporates a Mil-Dot reticle that is sharply defined and has variable intensity for best contrast on light or dark targets. To enhance the survivability and operability of these sights, the external objective lens and eyepiece lens elements are protected with an ultra-durable (scratch-resistant) coating which permits cleaning without fear of damaging the optical coatings.