You should've done xxxrippingmlgxxlegitxxx
Just kidding
You should do something like,
Call me Shoot
Hey Shooting
The Shooting
The Shootings
CabbageLuvsBoobs
Shooting Them
Shooting All
Hopefully one of these is open... change the Ibattle rifle tag bro, go 1337 mode
Just buy a cheap semi og tag (something like speeding not some shit tag like predominating) and swap it after a week or two to that account. You could get a decent tag that doesn't have a random l or multiple words. If that's not what you want to do its better than most tags on xbl.