Lightgun games that are not on rails

I just finished Resident Evil: Dead Aim and thought it was so cool to have a traditional free-movement style game with lightgun controls. Aside from the other three Gun Survivor games, are there any other lightgun games with free movement like this? (Preferably on the PS2, since that's the only platform I have a lightgun for, but I'd be interested to learn about others too)

I'm only asking about actual lightgun games. I am aware there are plenty of games on the Wii, Playstation Move, etc. with pointer control and free move, as well as games supporting gyro aim, but those are not what I'm looking for.