It hardly seems worth it just to own a gun.
And that is what I said in my post.
While I think it is absurdly extreme a group of individuals could incorporate in order to share ownership of firearms.
Here's a brief article about tax avoidance in the 70's
http://www.taxhistory.org/thp/readings.nsf/ArtWeb/CC7054D5ADE17F64852571A20068ED13?OpenDocument
Heck it was even featured in an episode of Barney Miller.