pretty sure i remember hearing that arming a r/c vehicle is illegal, if it isnt once frakienfien sees it, she will make is so im sure.
But after watching the video, im going to have to go with it being fake, beyond the recoil likely flipping that thing over, no smoke or fire issued forth from the barrel when it was "fired" as a owner of that particular firearm, i can tell you, both of those things do happen, and its noticeable, from feet away, the camera that showed the hammer fall, was way to close to have missed that. my guess is, they flew it unloaded.
I can also say, they looked much father away then the PD could hit a target that small with bird shot, you have to be very close for that thing to hit or the shot spreads to much. at 25 feet it covered a full size paper torso target. i cant even get mine to hit cans past 15 feet with #4 shot, or if you do, its all luck.