Bbl length has nothing to do with pattern size. Choke and load are the deciding factors there.
Yes, it'll work. A long mag tube on a short bbled repeater can make the piece swing more like an O/U, or like a railroad tie. Seen/used a few of each.
My personal choice in this matter would be to get an 870 Remington. ALL bbls(Except those lightweight field models) will interchange within gauge, and a mag extension will add those rounds you THINK you need.
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