After you figure out how you might hold, carry and fire this Rube Goldberg weapon, then think about why you’d want to do it in the first place. Here’s the official rationale, from the “Master Key” episode of the Sons of Guns TV show: “A local SWAT officer asks Will to design a gun which will cut down on the time needed between breaching a door and switching to a primary firearm.” And there I was thinking you shouldn’t enter a bad guy’s house without LOTS of cops. And lastly . . . how much? $1889 for Red Jacket Firearms modded Saiga. Yowzir! How about a Howitzer?