Well I can give you firm advice on what not to do. Chop it down to a barrel length under 18 inches and sell it to an undercover federal agent. A guy named Randy Weaver did that back in the '90s and almost got himself killed over it.
You got that right. I do want to keep it legal. The reason I want to sell it is 1- I need money. 2- I have an ongoing health problem and firing a 12 gauge with the recoil is not going to help. I also have a 38 special 'undercover' snubby for sale if you know anybody who might be interested.