I am no engineer or riflesmith, but I am fascinated with guns and weapons. For a military style weapon or one where you need to have reduced muzzle jump, why couldn't you build one with the barrel and action suspended below the handgrips? Imagine a Thompson gun turned upside down with two pistol grips above the barrel. Biomechanically, aren't the muscles in our arms/shoulders/backs stronger when we are pushing down rather than trying to pull down?

With an electronic ignition system, it wouldn't matter where the trigger was located.

The Mouse