With Challenge Lobbies, i might be able to get you into one but i wont guarentee anything (just ask Epic_Vipa) there are a couple of people you have to add, im not sure if they will make you pay but i got it for free, i got all guns attachments and all guns camos with every title and emblem (even the spinning 10th)
Theese people you have to add:
-Buzz-Kill-Gamer
-kyle_kicks_ass
- Other peoples names who i cant remember at this time if u ask them ^^ nicely they might let you in
PS: dont tell them im ur friend.
Rui