An accessory NVD that transforms a day scope, reflex sight, or ACOG-style optic into a night vision targeting system. This clip-on sight is modeled on the Mil-Spec PVS-24 weapon sight, and it is designed to provide return-to-zero reliability when mounted in front of the day optic. An integrated Picatinny mount with a quick-release throw lever, allows the M2124 to be rail-mounted in seconds.