BHC told you right if you're shooting any distance, or if you just prefer a scope. Cantilever barrel is the way to go.

If you're shooting 75 yds or under though, you may fine with a smoothbore slug barrel with iron sights. This way you can shoot "rifled slug" ammo that's MUCH cheaper and highly effective as well. My Mossberg 500 with smooth slug barrel will group just fine out to 75 yds.