Eistee
Resident of Colony 9
So in summary, the odds of a rare having any hit is 1/20, which is true for any rare in any location? That's quite low.
As far as I know, there are three rolls for %s of a weapon (as you know, a weapon can have 3 stats max), and each of those rolls can be for hit. So you basically roll three 20-sided dice and if one of them lands on a 20, you get Hit %s (it is more complicated than that, but this is a good picture).
At least, that's what people told me a while ago.