I used to use the Act Labs lightgun. It only works on WHITE FLASH optical games such as Hogan's Alley, Duck Hunt, Lethal Enforcers.
HOWEVER, it interrupts the video output and inserts its OWN white flashes for proper sync. Works very well. The white flash it produces definitely seems more obvious (slightly longer) than the one generated by the games and of course there is no true rapid fire as once you hold the trigger, all shots will focus on the same spot, even if you move the gun, so avoid titles that have rapid fire (operation wolf, underfire, etc).
It beats the AimTrak in terms of no minimum distance needed for tracking. You can hold it right up to the screen if you want. But obviously it must be a CRT display since it functions off the method used to draw the screen (delay from trigger pull to when the exact spot on the screen is drawn white).
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