VERY rare now so you'll never find one. Was a commercial rework of PVS-3 (hence the name) by cutting them in half, removing a bunch of the center, and sticking a normal modern image intensifier in the middle. Weapon sight, way too big for anything else, and some other issues with it, but at the time, affordable. There are no GOOD cheats for night vision. I even build and rebuild and my best tricks are super tricky, low return rate, require the ability and tools (more cost!) to rework gear and stuff. I'd just save up more for a baseline reputable PVS-14 (or similar, a Katana, etc) and be happy with that vs finagling things.