Nothing new here - when NBC News was covering the Clinton gun ban back in the mid-90s, they showed video of full-auto machine guns being fired while Tom Brokaw did the voice-over about restricting "semi-auto" firearms. When NBC was called on it, they said something along the lines of it being an "inadvertent" event with "no intention to deceive" but refused to issue a correction or retraction for this "minor" error.
And then a couple of weeks later, Brokaw & Company did it again.
This from the same network team that rigged a GM pickup with a remotely-detonated incendiary device to make it blow up on cue in order to demonstrate the dangers of side-saddle gas tanks - so their deceit wasn't limited to firearm issues.
I don't think the media has become more honest since then.