The primary weapon for the Bronco was usually the Zuni 5” folding fin rocket. It packed a good punch, but it wasn’t terribly accurate, and each rocket weighed a good deal. While mounting a 106 on an airplane would have its own weight penalty, each round of ammunition would weigh less. And the recoilless rifle would be a good deal more accurate than any rocket. And there was a plan for an autoloading weapon.