I wasted some good money on a Remington Rifled choke and screw-on-to-the-rib williams sights for my 870. I can shoot my bird gun offhand better than that gun can shoot off the bench at 50 yards. I was very very unhappy with it.

If you are going to spend the money, go on and spend it and go fully rifled. Otherwise, keep on with the smoothbores. The girlfriend shot a 4" group at 65 yards with her Beretta 390 20ga, an IC choke, and some old Winchester Super X Rifled slugs off the bench yesterday. Nothing but a bead on the barrel.