I recently got a GunCon2 converted to Gun4IR, and am able to play some lightgun games.
I'm having issues with Area 51 though (Running GroovyMame, running the arcade version of the game (not a console version).
The gun shoots fine, but I can't figure out how to reload. Natively, Area 51 asks you to shoot offscreen to reload. However, this doesn't seem to do anything. Under button assignments, I can only find P1 Buton1 (which is "fire"). There's no option for button 2/reload button.
As this is one of the most popular lightgun games out there, I'm assuming there must be a workaround, or some other version of it that works as expected? Maybe I have the wrong ROM or something?