I use 90 duro on the 4 o-rings 14x1.5, on the gun for the front and rear support, that go around the barrel sleeve. The harder material helps keep the POI from wandering off as much.
Yes, there are for sure more people did this mod but the story is already faded out. You either do it in five=5 minutes or better just don't think about it.
What you want to know? Hot and high humidity for sure will help, but if you hang a pickup truck from front of the barrel...well, a big guy up there can't (and won't) help you with that.