I had a PS1 Guncon, and one of those Nyko Guns you mentioned for Justifier games. Here are the lightgun games I have for PS1:
-Elemental Gearbolt
-Lethal Enforcers 1 & 2
-Area 51
My dad and I had fun with those for a few months, then oddly enough, we never picked them up again. I still have the games in my PS1 game case, but I have no idea where the lightguns are. Probably in a box around here somewhere. Haven't seen them in ages..