Yes they can be. Finding a smith that will do it right so it is centered over the bore is another matter...
If i was going to have mine done like that i would contact benelli and enquire price
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent