I own a mossberg 935 and recently I accidentally bumped the front bead on my gun cabinet when taking it out. The little red fiber optic piece cracked and can't be put back in. I'm leaving for South Dakota pheasant hunting In a couple days so I am in need of a new front bead. I was wondering if on the 935 has a bead u screw in or does it attach to the rib..? Sry idk much about this so pls explain. Thanks guys also if u have and suggestions for replacement beads that would be nix thanks!!