Browning Vector chokes fit Mossbergs (Accu-choke only). Browning has some real fancy tubes. I bought a 5 inch long rifled and ported tube for my Mossberg 500 last month for $60 (including shipping). If you are a serious hunter, I would look at Browning Vectors and Hastings because Accu-choke does not offer much variety. If you just want a cheap upgrade, then there is no better choice than Accu-choke tubes.
