american HotD2 is not light gun compatible at all
Do not buy official guns they are region locked, not to the system but to the games
unofficial light guns are great, region free work on VGA monitors (not LCD LED or Plasma just the good olde CRT VGA Monitors)
The 2 guns I have are by Blaze and work with all region games
EDIT: Oh I have already said all this here.... Anyway hope you have fun shooting your TV lol shame you didn't read this thread first