M921 Submersible Night Vision Sight (NVS)

INDIVIDUAL-SERVED SIGHTS Individual-served sights also provide improved night observation and aimed fire of weapons by using available light from the night sky. The primary difference between these sights and crew- served sights is that these sights are mainly mounted on hand-held weapons. AN/PVS-4 Weapons Night Vision Sight (NVS) The AN/PVS-4, illustrated in figure 1-6, can be used with the M14 and M16 rifles, M60 machine gun, M79 grenade launcher, and M16 with the M203 grenade launcher. This sight is powered by two BA 5567 lithium batteries with an estimated life of 12 hours at 23 degrees Celsius. Its range is 400 to 600 yards for man-sized targets, with a 14.5-degree field of view. The AN/PVS-4 is used by both fleet and Naval Special Warfare units. M921 Submersible Night Vision Sight (NVS) The M921, illustrated in figure 1-7, is a submersible-sight for use on the 5.56mm and the 7.62mm weapons and for general observation. This system provides a high resolution, intensified image for effective viewing and aiming. The submersible design provides watertight protection to a depth of 50 meters and salt water corrosion resistance for missions requiring underwater transport. The M921 has a range of 300 to 500 yards for man-sized targets and a 13-degree field of view. It weighs 4.6 pounds and is powered by either a BA 1567 mercury battery or a BA 5567 lithium battery. Aquila Night Vision Sight (NVS) The Aquila sight, illustrated in figure 1-8, is used with most 5.56mm and 7.62mm weapons. This system was procured by Naval Special Warfare as a replacement for the AN/PVS-4. The Aquila sight offers better performance, lighter weight, and improved accuracy. The Aquila weighs 2.7 pounds and has a range of 400 to 800 yards, with an 8.3-degree field of view. It is powered by two BA 3058 “AA” alkaline batteries with an estimated life of 40 hours at 23 degrees Celsius. 162.1 Figure 1-6.—An/PVS-4 weapons night vision sight. 1-6