On my CVA Staghorn Magnum I cracked the fiber optic part of the front sight soon after buying the rifle. I took some clear see through package strapping tape and taped it back on until I could get around to fixing it. That was a year ago, and your post just reminded me, I have to fix that sight!!
I done the same thing on another rifle and fixed it the same way, but bought a different fiber optic sight for it. The problem is a number of the fiber optic sights are all made from plastic and especially when it is cold you have to be so careful not to bump them at all. All the CVA did was slide a short distance along the wall before I grabbed it, and that fast, it was cracked.
You might want to look into a quality front sight made of metal. I think some of them made for the Lyman rifles are metal. It might require some special drilling or tapping to install them. Otherwise you might have to make due with what is offered out there.
Maybe it is time to mount a RED DOT scope. I put one on my Knight and really enjoy the accuracy and shooting it.... (kidding of course.. you want a sight)