Are you wanting to buy a new shotgun? I would just add a Blackhawk stock and a Remington short 18" barrel and a extension tube. to one of your 870,s. You can add a optic or red dot and still use it for hunting just remove the extension tube. All this for less then $500.
“There are hundreds of millions of gun owners in this country, and not one of them will have an accident today. The only misuse of guns comes in environments where there are drugs, alcohol, bad parents, and undisciplined children. Period.” Ted Nugent