I used a set of Briley Companion 28 gauge tubes years ago in a Tikka 412s 12 gauge.Another option is to get a set of tubes, such as those by Briley. You would have to go down a gauge ie 20 ga tubes in a 12 gauge gun. They add about 12-14 oz weight. Briley also make short tubes which are about 8 oz or so.
They were awesome!
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