I own a Remington 870 tactical shotgun. And after doing all the Magpul upgrades I'm looking to put on some a greater sites. Never having do it I'm curious how hard are installations of of Some of the fiber optic / tritium Sites. I seen a lot did seem to be self adhesive which really sounds odd to me.
So I'm curious who has what and what works the best
If your 870 is for home defense the screw on beads from Brownells will work. They don't last long in the woods. Most of the time a few encounters with really thick brush pop the fiber optic material out of the bead.
Here is an alternative, Meprolight tritium. The threads never line up right so you will need a spacer of some sort. This one has a very small o-ring under it. I also used some blue lock tight and it is solid as a rock .