I'd not worry about the gun being on the buy back list - the xtrema just comes with a range of different size magazines. Just the big ones must be converted or handed in.
To be legal the shotgun must not be able to hold more than 5 x 3.5"shells in the magazine tube, it being chambered for max shell size of 3.5" magnum shells. Plus one in the chamber. I take it that is what you refer to when you say it is "6+"? (convention would usually be to call a gun with 5 in the mag and one in the chamber a 5+1).
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