Trijicon's new Tactical Advanced NightVision System (TANS) brings cutting-edge night vision to the front lines in a compact, rugged and easy to use sight. The sight is specifically designed to work in front of Trijicon ACOG sights with negligible affect on boresight. Designed for both military and law enforcement applications, the entire unit can be added or removed effortlessly from a MIL-STD 1913 rail. The 24-ounce Trijicon TANS is made with a low 1.5 inch optical centerline that is free from parallax errors. The Trijicon TANS is available in three versions; a U.S.-only Gated version, a NATO-Spec 1600FOM version, and a Non-NATO 1250FOM version.