One more thing, people say use Win, Browning or Mossberg chokes, but they won't all fit. I think there's only one Winchoke, but with Browning, it has to be the old Invector tubes, not Invector Plus, and with Mossberg, you want the old Accu-Choke, not the newer Accu-Mag or Ulti-Mag versions. Also, I bought a Winchoke IC tube that just didn't fit, even though it's supposed to. It just wouldn't screw in all the way. It's the only Winchoke tube I've tried, so I can't say if it was just that one tube or not.