For defensive use on a Benelli, the nice people at Patternmaster recommended the Benelli Standard (~$80, IIRC) tube, which is same thing as their "Police Fist" tube referenced in one of the magazine articles on their web site.
Mine is unported. As I have not yet patterned my Benelli with the Patternmaster, I don't know how much it will shrink my patterns. Gotta find out soon, I guess.
On a semi-related topic, one of our local IDPA clubs is looking hard at adopting some shotgun rules drawn up for IDPA type competitions. Starting next year, we may have monthly IDPA shotgun shoots (requiring buckshot and slugs to make it more realistic).
Justin
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Justin T. Huang, Esq.
late of Kennett Square, Pennsylvania