Talk:Mastery Rank/@comment-69.148.199.232-20130409085141/@comment-69.148.199.232-20130409201817

Its a time limit placed on players so that they can't grind for certain items upon entry.

Notice: Rhino and Heavy weapons are locked from rank, but every smaller warframe and most other weapons are not. Most players don't even want to play rhino until later anyway.