What kind of rear sight for a PSA upper? *Link*

I want to get it painted/cerokoted so I would like to stay away from optics. What kind of rear sight should I get? A bolt on carry handle, flip up sight or ?? Take off front sight and use a gas block and ???

Or change completely and cut down front sight, put on a free float tube, and use a holographic sight?

Looking for a few ideas.

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