It's not really something I give much of a damn about. Except I'm 90% sure said gun owners would just give in meekly, and the remainder who tried to fight would be arrested or eradicated.
It was already obvious that the constitution is something you don't give a damn about. Don't be so sure about your silly belief that most people would simply "hand in" their firearms. This isn't Australia or the UK and the right to bear arms isn't in their charters.
What they'll probably do is keep restricting the power of the weapons you can legally carry and make it harder for certain people to acquire firearms. There is pretty much 0% chance guns will ever be illegal in this country, or that anyone will go around collecting them.
The industry will always stand ready to provide innovation and ways to get around those laws. Even during the Clinton era ban where certain weapons were criminalized, the industry managed to import millions of weapons that were compliant with the ban, among them were 10 million Russian, Yugoslavian, and Chinese made SKS rifles.
That is not my problem. While I do find the number of mass shootings in this country quite disturbing (and even more disturbing is the fact that gun owners, who one would expect to be even more keen on gun safety considering their experience, seem to be completely apathetic about it, which speaks to the effectiveness of the NRA's brainwashing), I am not actually anti-gun. So that would be the government's problem.
One of the NRA's biggest accomplishments is promoting gun safety, yet you claim that are "brainwashing" people?
Not to mention, they're the oldest civil rights organization in this country. They don't discriminate against any person's right to arm themselves, white, black, yellow, red, or otherwise.