Ok, the update!!! My CZ858 is stock with a factory folder.
First, sorry about the wait, life has a way of getting in the way of living.
Second, I smashed my cell phone camera and don't own a digital so there are no pics.
I had no trouble installing the sights, as stated, and finally got to the range today. The sights adjusted as well as the original, and using the sight tool made it easy. I shot at 25, 50 and 100m, and used 20rnds of non-corrosive huntable ammo. The site picture with the red front and green rear is fantastic. Crisp and clean with perfect contrast. The point and shoot at close range, under 50m was quick and easy, put the red dot on the target and let loose. I then set about shooting at 100m and the red front still was quick and bright against the black target. I found it natural to keep the red in between the green, it seemed to come naturally to the eye. After all my adjustments where completed I applied loctite to the front sight to keep it in place.
I look forward to more shooting and plan to use my CZ858 as my pack/ hiking rifle and hope to take a bear with it.
I like these sights and will recommend them to anybody.