Quality sights - Ultradyne C4 Flip-Up Front Sight

I like these sights quite a bit. I have them in a few of my rifles. Nice dial adjustments for windage and distance. Also no tool needed to adjust front seight hight either. And in my opinion I really like the peep hole in the front sight gives a nice sight picture and also makes co-witness with a red dot or circle very cool and easy to sight.
Also, they do offer a good number of variations whether you want to change the peep sight size in the rear , or on the front post which they offer different size holes Including an original style front post without any hole