How Do You Reduce the Number of Guns in America?

I'm going to play the part of the gun control opponent using a few of the arguments that I've read in comments sections and heard on podcasts. Comments, apologies to any opponents of gun control listening because I'm not going to do a great job on your behalf but I'll do my best. So practical question about reducing the number of guns. How are they going to manage to take hundreds of millions of guns already circulating around America back? Surely the criminals are not going to hand their guns in. Unless a good question. And for that, the only suggestion I have is to look at places where it's been done. In Australia, after the shootings in Tasmania, they did a massive