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Just call briley in the U.S and they will drop them in the mail and you will get what you want at a good price. they use the browning invector plus chokes and i think briley makes them all now.
Get Carlson choke tubes from Al's corner store, i think i got the waterfowl screw ins (3 chokes) for 115 to my door, you don't need a wrench just screw on, invector + of course, great gun, I got the walnut field