Remington 1100 Rib Width?

[beagler]

I have a 20ga Remington 1100 with a ribbed barrel and a fixed bead. I wanted to order a fiber optic bead for it but can't seem to find what the correct rib width/size is. The current bead does not screw out. I wanted to pick up one with a metal frame that snaps on with a piece of adhesive tape underneath. I know the magnetic ones pop off. Anyone happen to know what the correct rib width is on the 20ga Rem's?

[Tom007]

Found an old post on here, they say it is 5/16". Hope this helps

[Tom007]

Look under the 20 gauge thread, it's from 2013, I replied and brought it up. Good luck...