IMO fiber optic sights are the biggest piece of junk to come down the road in a long time. Cheap plastic junk as far as I am concerned. I have been shooting steel front and rear sights for years with no problems. Just about everyone I know has had problems with the fiber optics. Breaking, and even falling off.
Bingo!!
The fiber optic thing fell off the front sight of my Encore before it got out the door of Gander Mountain. One of my muzzleloader rifles wears sights from a Remington 700. The fiber optic junk on my other two guns were removed when the guns were scoped.