Battlezone 1

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Circle:

Notched Crosshair:

They are shown as I drew them in MS Paint (green) but in-game they are blue. I knew they weren't going to be green in-game, but I never expected blue. I think blue looks good, it's a nice change from Red or Green.
(They're not blue in SW mode, but they are still usable)

If you want default scope back, go here.

If you want other custom scopes for both BZ and TRO, go here. (It also has default red dot scope for BZ and TRO)