First I want to say I think everyone should have the right to the same weapons out government uses.. Full auto, explosive etc.
That being said, in our current environment, this video is a bad idea. I feel it will be used as evidence against the kid, especially with the construction of the "sear" and "cam" and having to modify the trigger I also think they will say that all you have to do is squeeze the trigger and hold it back and not pull it multiple times.
I warned people for years about posting pics of pistol braces and talking about shouldering them as they would become illegal. Everyone said it would never happen because of the atf letters and look what happened. Keep the crap off the internet..