Dear Guys,
Two days ago, MSN news had this exact tape on their website, along with a story saying that this was fully staged with actors and a trained chimp. The tape was made by the producers of the new Planet of the Apes movie, and placed out in the internet, in order to hype the movie by suggesting that it is possible that apes will evolve into weapon wielding creatures who may wipe out mankind.
I looked at the tape many times, and couldn't help but notice that when that rifle is going off, facing downward, there are clearly no bullets hitting the ground or anything else.
A funny little tape though.
Mannyrock