Unreal:
extract TeiganGun.u into your unreal\system directory. you don't need the other 2 files.
See Teigans read-me for the summon commands.

Unreal Tournament:
extract everything but the txt files into your UnrealTournament\system directory.
choose Teigan Launcher Arena or Teigan Launcher Mutator as your mutator in game.

--Kangus
http://wod.beyondunreal.com