UV
here is a good video of a D2 w UV: https://www.youtube.com/watch?v=LTk1XAh8EFU
and a good review of a D2: https://tgreviews.com/2023/04/26/emisar-d2/
the reviews have differing opinions on whether to choose the spot optic or the flood optic.. I went with the flood option and am very happy with it.. (it is Not Very Floody, it just makes the beam round instead of square)