Take note.
These guns don't work with MAME. These are their first generation guns that went through the joystick port. They would have required mame to use a special calibration utility to get working (and nobody ever compiled a version with it... or even came close... I hear Actlabs sent guns to some of the 'bigwigs' hoping they would put support in the official, but nobody ever bothered.
The ONLY way to get them to work is with a beta mouse driver... that sucks... and is only one gun.
I have a pair of these and have offered them free for shipping... (Rob, did you still want these? I forgot)...
but basically... they aren't worth 70, 50 or even 5 bucks... unless you have a very very specific plan for them that includes you programming.