Austin is believed to be “Hogwit”, the manager of the YouTube account where the video entitled “Homemade multirotor [drone] with a semiautomatic handgun mounted on it”, was published (and which you can see here) on July 10th , 2015. There is an additional caption which states that “the length from the muzzle to the rear of the frame [of the drone] is over 26″.”
Hogwit’s fourteen (14) second “demonstration video” shows a robotic device with four rotor engines firing four (4) shots in succession. Each time the handgun is fired, the drone is knocked back some distance, but it remains stable enough to discharge a bullet once every three (3) seconds. Both handguns and this type of drone device are widely available in the United States, and this drone appears to have been equipped with a mechanism to pull the trigger remotely and on command.
The image above is a still taken from a 2012 video clip where an unnamed Russian enthusiast attached a machine gun to a much more advanced drone than the one seen in Austin’s Connecticut video clip (you can see the “Prototype Quadrotor with Machine Gun from FPSRussia” video here). The image below is a still of a prototype “Taser Drone”, but there are amateur versions of the taser drone as well, and you can see a video and detailed description of one here.
According to the Federal Aviation Authority current rules already prohibit attaching any form of weapon to any kind of aircraft (please see the Electronic Code of Federal Regulations), and in 2013 an FAA officials told industry leaders that ‘We currently have rules in the books that deal with releasing anything from an aircraft, period. Those rules are in place and that would prohibit weapons from being installed on a civil aircraft.” (Source The Washington Times, “FAA Official: No Armed Drones in the US”, written by Ben Wolfgang, published February 13, 2013.)