Whites are still the leaders in engineering; even though the often serve the wrong master. One white engineer scared the USG a bit.
He made a drone that shoots bullets, before they did. That’s the way it is though. Amateurs make most of the progress in science. It was this way the early days in radio, cars, computers, electronics, and drones also.
The FAA has cooked up a set of rules, of course. You already know them: if you work for the USG, you can do whatever. HOWEVER, no civilian drone can have a gun on it.
The recoil on this gun directs the drone down and back mainly.