Most shotguns don't require modifications to hold more than 7 rounds. I don't think they make a 20ga version, but virtually all 12ga guns are llegal because of...
1 3/4" mini-shells
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.