I have a hard time believing that this is from "Anonymous". I'm no expert, but everything I've ever read about/by "Anonymous' has always painted them on a more liberal light. Firearms has never been their bag, nor has calls for any form of armed resistance. The date on this video is also old. Even taking into account the other more recent video that specifically addresses firearms, I still have a hard time accepting that this is an issue for them.
and besides, pretty much anyone can post something as 'Anonymous". They don't seem to be interested in a unified voice. I've even seen "Anonymous" coming out on both sides of an issue before.
Add all this to the fact that they go absolutely slaughtered last year by the FBI in multiple raids fed by the informing of one of their ideological elite, and I suspect that their ability, as a collective, is greatly reduced. Not to say that lone individuals can't DDOS websites or hack emails, but I think they're ability to act strategically is hurting.
Bottom line: I think this and other videos attributed to "Anonymous" are much adieu about nothing.