I have had Ford and GM both threaten to destroy cars they made, that I bought from them and took back, for service under warranty. Happens all the time.

If Beretta thinks that they can both destroy the gun and not replace it they will find out what a decent lawyer can do to them. Even a half baked lawyer would love to get that case. I would tell them that they have two choices either return the gun, exactly as is and right now, or replace the barrels at their expense. Failure to do one or the other will result in immediate legal action. We are not talking about a $30.00 item here. You buy a high dollar gun you expect high dollar service.