Yes he really said that.
Aside from the disturbingly threatening implications of what he just uttered, it's insane how far removed this old man is from the basic ideals that comprise the foundation of the United States of America.
The Second Amendment is intended as a safeguard against tyranny. The government should fear the people—law-abiding people should not fear the government.
When the President of the United States is making statements like the one you just watched ... it's time to be concerned.
I'll leave you with this quote from a guy you might have heard of, oh, because he was a Founding Father and the principal author of the Declaration of Independence: