Should be an easy fix. I have never seen just plain bead sights at Gander Mtn or Walmart, but I never looked for them there. I would think a simple phone call to Customer Service at H&R would be all you need to do. I think I have a couple of plain beads around here, if they are the right size, I would be happy to mail one out to you. Maybe someone else will weigh in here and fill in the blank info for us.
cookiemann