In gun buyback talk, how do you round up so many weapons?

Democratic presidential candidate Beto O'Rourke's recent vow to take away people's AR-15 and AK-47 rifles raised one big question: How is it possible to round up the millions of such guns that exist in the United States?Many gun owners are also unwilling to turn over the weapons, and if the government offered to buy them all back at face value, the price tag could easily run into the billions of dollars.O'Rourke's pointed declaration during a recent debate — "Hell yes, we're gonna take you