RE: fiber optic sight
I'm with Jay7108. I have Hi-Viz sights on all my shotguns - Ithaca M37, Remington Wingmaster 870, and Baikal IZH-27. My Ithaca and Remington are plain barrel and I use the Hi-Viz Plan Barrel sight (snaps around the barrel - don't have to take off the original bead). My O/U mounts to the rib and is magnetic. I have tried some TruGlos but I prefer the Hi Viz.