Curiousity won out I had to look, I have a couple of Freedom 3-9x40 and I checked them. They do not have an O-Ring but they do have a flat gasket of a synthetic of some sort and when tightening the covers they definitely have a bit of give that can be felt when the cap is tightened.
It actually appears to be a bit of a better solution than an O-Ring, they are wider and likely give a better seal than an O-Ring.
Take a look in good light and use a magnifying glass or hook a finger nail on the gasket and you can feel it, if it is there.
drover
