David,
I'd ask Chris directly as he should know.
My SWFA 3-9x also has a stiff mag ring. I just deal with it as it doesn't bother me, but maybe its not as hard to turn as yours. I've seen some Leupos that are really, really hard to turn.
Not sure on the o-ring material and don't even want to guess. I've always heard that the problems in cold temps were due to the silicon gelling but o-ring getting stiff would make sense.
I reckon there are simple explanations for these issues and the answers are just clicks away.
Jason
