It is. The system does a pass/fail roll at every level - like if it's an 810 it rolls for the 815 upgrade, then again for the 820, etc. (from my memory, someone correct me if I'm wrong, I'm paraphrasing a developer explanation, I hope).
You have to basically succeed in all those rolls (which have a tiny percentage of succeeding individually, so infinitesimal all together) to get an 895. With the amount of people playing and the amount of gear on offer, I have seen a few people that strike it lucky, but that was on a single piece of gear for each.
Trying to get a full set that way would be an extremely inefficient use of your time.