Use nothing buy HIVIZ on all of my shotguns, and I've never had one break off. I use the CompSight on everything, and have found it to be extremely reliable since it takes the place of the bead. A little Loctite and the right gunsmithing screw provided by HIVIZ will keep it in place. By the way, the HIVIZ stuff isn't fiber optic, it's a light pipe. Over time fiber optics loose their luster, and the color will fade. Light pipes are kept bright by any light source forever.