I HAVE HANDLED THE FIRESTORM .40. MY FRIEND HAS SHOT THE 9MM AND THE 40 FROM FIRESTORM. HE LIKES THEM BOTH AND SAYS THEY ARE RELIABLE AS ANY OTHER GUN OUT THERE. THE ONLY THING I NOTICED WAS THE NICKEL ON THE BARREL STARTED FLAKING. BLUE STAYED BEUTIFUL ON THE NINE! I KNOW FIRESTORM WILL FIGURE THIS OUT SOONER THAN LATER BUT THE NINE AND THE 40 BARRELS ARE INTERCHANGEABLE AND WILL WORK IN EITHER. THE MAG MIGHT HAVE TO BE CHANGED AS WELL. I THOUGHT THIS MIGHT BE A GOOD WAY TO HAVE SOME VERSATILITY AND MAYBE SHOOT THE CHEAPER NINE ROUNDS. DON'T KNOW HOW MUCH THE BARREL WOULD COST BUT IT IS A 2 SECOND CHANGE! OVERALL I ALMOST BOUGHT THE GUN BUT ENDED UP WITH A CZ-75. I DON'T LIKE NOT BEING ABLE TO BUY GRIPS AND HOLSTERS FOR MY GUNS. IF IT BECOMES MORE POPULAR LIKE I THINK IT WILL, I WILL HAVE ONE!