I wanted a modified choke for clay shooting but my 590a1 only comes with a fixed cylinder choke for HD that cannot be changed without modifying the barrel permanently. I was told that the 835 barrel would fit on a 5+1 18.5 setup so I ordered it. Just came in today and it fit perfectly and came with 3 interchangeable chokes to use when I'm out having fun shooting clays and can put back the original 590a1 stock barrel when I setup for HD purposes. What I ordered: 835[REGISTERED SIGN] Ulti-Mag[REGISTERED SIGN] All Purpose Vent Rib, Ported, Bead Sight, 12 Ga., 28", Accu-Mag Set, Matte Blue, SKU 90831 Before: After: Will take it out this weekend and see how it shoots. ** the only negative was that the inside of the "new" 835 barrel came with a lot of rust. Took me an hour to clean the best I could with FrogLube. I hope it doesn't mean the barrel is no good. Should I return it and ask for a new barrel?