I got what appears to be a knockoff of Konami's Lethal Enforcers-style lightgun for the PS1 the other day, and it doesn't seem to work with my games. I tried it with Project Horned Owl. The trigger works, but pointing it at the screen doesn't do anything. It doesn't detect the screen at all.

I thought I had a faulty gun but then I tried a Nyko Super Cobra (a PS1/Saturn gun which has both Konami and Guncon modes, and even vibration!) and it didn't work either. But, then I tried the Guncon mode, and it worked just fine.

I'm wondering if the slim PS2 doesn't like Konami-style lightguns... or if something else is going on. Any help?