Is Gun Control Possible? Gun ban effective?

Would it be possible to ban all guns in the US? Here are a few obstacles:
1. Existing guns would work for decades or longer.
2. About 178 guns are stolen from law enforcement a year. https://www.thetrace.org/2018/11/lost-and-stolen-police-guns/
3. People make improvised explosives at home already, and use them: https://www.atf.gov/file/128106/download
4. Oklahoma City Bombing killed 168, more than any mass shooting, and was done with no guns at all. https://www.history.com/topics/1990s/oklahoma-city-bombing
5. Meth is made in many small towns, despite opposition on the same level as gun control. https://money.cnn.com/interactive/news/meth-lab-map/