- GoPro is a company that sells sturdy high definition digital cameras that many people have been using to capture extreme sports.
- Occulus Rift is a company that sells virtual reality goggles. The company has recently been bought by Facebook.
- Drones or quadcopters are very stable VTOL capable helicopters powered by 4 rotors. There are many companies that sell these drones.
Which means that anyone with two to three thousand dollars to spare can now easily purchase the parts necessary to build a remotely controlled, highly stable VTOL capable craft that can be equipped with some kind of weapon. This is a really, really bad idea that's just turned in to a practical reality.