My friend from SRX X-FRAME found this still works here is what he posted. Not that we ever have that many people on MAG but good to know none the less.
There is still a glitch where you can have more than 8 people in a single group. I am in a group now of about 18 people (2+ squads).
All you need to do is have there be 7 people in a group at most (1 free spot).
Then send invites to everyone you want to bring in (but don't have them accept it).
And then once everyone has their invite .. everyone can accept and everyone will join the group.
Also here is funny Knifes only video Frame Made.Knifes only fun!
Also a nice Shotgun VideoShotgun Fun!!