I haven't had time to try the gun yet, I need to figure out how to wire the sync line into the rca, I was going to try this with my cabinet so I guess I should wire it from jamma's pin 13 which already is c-sync. I'm afraid to short the JPAC if not done properly.
I've been thinking of the rolling-x issue. You said the gun sets itself for 100 Hz. How does it look when that happens? I've never tried this so I'd like to know how it is so I can recognize it when I see it.
I wonder if the issue has to do with the gun expecting interlaced video from the Playstation 2 and being confused by progressive video from MAME. Have you tried the Namco gun with interlaced video?
I don't have 100hz issues on mine. I'm not sure what intelligence is in the actual gun to set the refresh rate a Groovymame sets that.
Is this the "rolling x" issue being discussed?
If it is, it would explain why I haven't perceived an issue. That happens when you point the gun away from the screen so it loses position and regains it when you point the gun at the screen again. It looks alarming on the calibration screen but there is no crosshairs onscreen during the actual games (on real light gun games).
So far it hasn't effected my accuracy on Time Crisis but I'll give the GC1 a try to see if I prefer it. I have one of those ems light gun adapters here.
I have an act labs gun here too but so far, I have preferred my GC2.
I've included a video of the rolling-x in action:
https://drive.google.com/open?id=1YgllTADNaW_PjFV971jxFnu102OGzEfwYou're not seeing that on your setup because you use wingun, which has a fix for it, though not a perfect one for dark games like house of the dead 3.
Please read this to understand the issues with the rolling-x on wingun:
"--Troubleshooting/Known problems:--
The Rolling X problem is not fully fixable, we do not have all the information we need. Because of this, support for guns in Rolling X mode is a hack. The user MUST do the following with guns in Rolling X mode:
When bringing the gun back onscreen from being offscreen, it must be done on the left or right side of the display. It cannot be on the top or bottom of the display.
The gun should not be jerked from side to side, smooth motions work best.
Guns in rolling x mode will always experience these problems:
After pointing to a black or dark spot for a second or so, the gun may skip to the other side of the screen. Simply wave it offscreen then back on, or across the center in order to regain correct positioning.
The gun cannot be moved across a dark center screen. If this situation occurs, you will need to bring the gun to the section you need to point at from the left/right edge (whichever is closer).
Some guns (specifically the Namco official one) will jump to the center of the screen occasionally. This can cause the gun to move to the wrong side of the screen the same way a black spot can. I have done all I can to fix this, the gun is returning an incorrect position when it is in a darker but not black area.
For all guns with the rolling x problem, you might have best luck shooting targets on the egdes of the screen by bringing the gun onscreen from the closest left/right edge."