The barrel opening lever turns to the opposite side, for specifically built LH shotguns. Mount the gun to see for fit and then open and close the barrel to see if you are ambidextrous. You might find you are equally adept or comfortable at both or not.
The shotgun might have a cheek piece on the wrong side. No big deal, you can have it removed.
Lastly, if you get fitted by a competent fitter. You will know what you need for a cast on for a LH, to engage targets to your full potential. Also no big deal, because you can find a competent stock bender and they will bend the stock to your dimensions. LOP will have to be adjusted to you and the recoil pad turned slightly for a leftie orientation.
Beretta is a quality gun and others have made them for lefties. Go to Gunsinternational.com and look up left hand shotguns. There is usually a couple of o/u's.
Best of luck to you.
