If someone got into a legal shooting situation, they could be labeled in Court as evil for cutting the barrel. It is better to buy the proper barrel length or a already set-up shotgun with a friendly name such as Winchester Defender or the Mossburg Crusier.
Check pawn shops and ebay. There are lots of 18.5 inch bbls for sale used out there.
Im looking for a short tube for my 20 ga mossberg now.
The slimy lawyers and anti-gun/self-defense prosecutor will use customization of your gun as an indicator that you wanted to shoot someone.
Libs are idiots... I'd love to have a bunch of yellow flowers painted on a pink background with small orange butterflies...covering my 12 gauge as I wipe the blood of 3-4 home invaders off and the media and cops arrive..
...priceless