My mod chip won't allow gun to work w/ Time Crisis

this is beause you need the namco gun for the game
i came across this years ago when i copyed it
and my universal gun whitch is for both psx and sager saton would not work ether it is not werth bying the gun for that one game as it is rarther expencive i finished play the game with joy pad
and completed game in just over 40 minits