There are several Night Vision compatible weapons sights to choose from. The choice really comes down to personal preference. One of the newer choices is the Aimpoint M3. Like the M2, the M3 is compatible with every generation of NVD. However, it features a new technology called ACET which allows 50,000 hours of operation on one single battery (on setting 7 out of 10) 500,000 hours of use on NVD setting. Additionally, it's available with 2 dot sizes (2 and 4 MOA). Like the M2, it is submersible to 45 meters (135 feet), not that you'd need to go down that deep anyways. And, it comes comes with replaceable outer black rubber cover or a dark earth brown cover. The NVD (typically a PVS-14 monocular), mounts directly behind the sight, as most do. Expect to pay around $500.00 (U.S) for it.