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Recently I ve seen a YouTube shorts about the American M320 grenade launcher.

In the video, the narrator mentions this is a "Day/night optical system for the grenade launcher".

I tried searching up this specific optic system, because I am interested in finding out how it works (specifically the night feature), but I couldn't find anything. Also in the video it didn't mention any name related to this sight system, it just said it is a day night sight.

If anyone knows how this sight works, especially the night-vision feature, I would appreciate it if you could explain it's mechanics.