see my post in this forum on the NEF 20 gauge bull barrel slug gun. Great sytem, accurate out to 125 yards, lower recoil, good looking, easy maintenance, and inexpensive. I'd recommend it to everyone.
I bought the interchangeable barrel systems in about 6 different calibers for a heck of a lot less than buying different guns. You'll have more money tied up in different scopes anyway if you did buy more guns! I love my system!