I told you: check the league's server, there's elimination there, or you can connect on the aftershock irc:
#oaUnofficial@irc.quakenet.org
There you can also ask to play elimination on RN aftershock server.
But you can join every clan's irc and ask everyone you see for all-weapons, or elimination, or whatever you want
Most of the players play rockets or rail ye, but there's also a lot of other mods played