The barrel you are speaking of is the first generation, Tracker I. The factory still has some of them. You should call first before sending off your frame to have one fitted. I sent off for the 20ga smooth bore earlier this summer, as did a few others here on the forum. You are correct, they have rifle sights and a SMOOTH BORE for using the less expensive "rifled slugs". Good Luck, if you hurry, you may be able to get it back in time for Deer Season.