Talk:Mastery Rank/@comment-23775540-20141121092500/@comment-8256051-20141122155120

Check in your codex if you got all the prime stuff, all the dojo stuff, all the archwing stuff and all 4 kubrows. Those are the ones I think someone could've easily forgotten. Also what the Lone Tenno above me said : check if you didn't forget any mission node.

But also, if you read carefuly this page, it says that it requires at least some limited edition (event/founder) stuff to get to MR18. Maybe you're missing some. If that's the case, you'll just have to wait for the next update that brings new weapons.