BudsGunShop.com - Switching the barrels

Wiley. If you can find a 40 S&W to 9 mm conversion barrel for this pistol you could. I am not aware of one in production.

You can contact Beretta to get one. It would probably need some fitting which usually involves trimming the back of the hood. The only one Beretta offers is the 40 cal.

Wiley, yes Sir. I would also recommend getting 9mm magazines for best reliability shooting 9mm as well.