Hmmm, I can get the guns to track in MAME (which didn't work last time I tried the WinGun drivers), but I can't get the trigger to respond. The screen flashes (as it should), but no bullet hits can be seen. I'm starting to think this is actually a 117 issue where the new control system doesn't like the driver remapping the buttons or something. I'm not quite sure. It detects the button press in MAME when I'm setting things up, but it doesn't accept the location when I'm trying to test it out. Weird. I guess this isn't a MAME Compiler question any more, so perhaps I should open a new topic if I decide to continue discussing this here. Thanks for the suggestions HK!