If you have not found a sight yet, Brownells sells an exact repo, like the one on the rifle in the last picture. It's only $25.00, very well made for the price, fully adjustable with knob for windage and has reliable click stops, all marked for the different ranges.
It's a steal at that price, I put one on my older Mini ranch and like it a lot.
I needed to shorten the front sight and thin the front sight blade and it sits higher than the stock Mini sight, but I really like it. Just don't dissassemble it, the windage knob is well staked on, but if you take it off, you will need to have someone who is a good welder just hit it lightly with a tig torch.
Mine looked perfect after it was fixed. I took it apart as you have to modify the sight to fit iton the Mini.
Great sight, they are always in stock.
It's not the flip over sight, it's the fully adjustable one.