Does this scope have a zoom wheel marking at 16X?
Yes, it does
what adjustable objective side wheel works with this scope?
There is not currently one available. There are a few custom side wheel makers out there, I'd check the forums.
I see that it's called shock proof does this mean that it's spring rifle rated? Also is there a side wheel available for the parallax adjustment?
Yes, Athlon rates their scopes for use on spring and gas piston air rifles. No larger side wheel available at this time.
Does it come with rings?