Normally, dampers do rebound - the rate of rebound is dependent on how they are valved.
So, if you compress the rod, and it doesn't come back out, I'm pretty sure they are "dead."
With that said, I can't confirm this is how the adjustable OEM shock on the FC should perform, but I'm 99% sure this is the case.
Besides, the OEM adjustable suspension is crap compared to even the entry-level aftermarket shocks available out there.
-Ted
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