First of all i don't know if this is posted already or not, but i found another way how to boost/or get your friends in free for all.
What you do is
1.get your friends in a party chat

2.Search for any game type and when you and your party are in a lobby(not ah game) host back out clicks leave without party

3.Host then highligts on the mode he wants to play and tell your party to back out at the same time you click on free for all etc.

4.On host screen it should be searching for a match, but on their screen it'll probably just say your in the lobby

+Rep please this is my first legit glitch that i think i found ? Well just let me know if you need help or anything

xDPAxHELLSNIPAx