Well, I partly misunderstood something you said I think.
Northern is correct in that you want to disable mouse acceleration, and maybe even reduce
sensitivity in windows.
If anything, one would move the gun and the cursor would lag behind it because the
guns realtime tracking will not be as fast. If the cursor is moving further, then the acceleration
is the cause.
Yet, no matter how close you get.. it will never be perfect because the hardware is not
designed the same way as the original guns.
Zombie Raid used Positional Guns. Which are basically just Analog Joysticks. In fact, you should be
able to control the game even better when using them instead. T2 was also such a game.
Area 51 however, is a true lightgun game. It doest track in realtime. Only when the trigger is pressed.
There are hybrids.. which use the Topguns same technology. Led infered sensors. However, these
also are not realtime tracking as far as I know.
Realtime tracking with near perfect accuracy is possible.. but it would require some extra horsepower with
dedicated processors and or a dedicated PC card ..I think.