93mouse,
The third front sight you posted is a standard bead with an optional large bead that folds up for low light use. The small bead looks like it is silver or white. I would like the gold bead if I bought one. The flip up big /low light bead is an interesting option but you will have to decide if it will be some thing you need. I like 400 Nitro’s pick for a rear sight.
Bill