Hi!
I got from about 40 missions in Terror Dome in levels 26-29 following unique items:
Sledge Hammer - 5
AR-99 - 3
SCAR -2
and nothing other types.
I'm not sure, but thinking all rare items was also only this 3 types.
So, are the items from Terror Dome not random?
Then I would like to know the limitations for all levels.