>Even if you make the selling of guns completely illegal, how will that change anything? There are still tens of millions of guns in circulation in the USA. Many of them are family heirlooms.

It will take a few decades, but the number of guns will go down if they can't be sold, or maintained, or used for practice.

This happened in Europe, which was awash with guns after WW2.

Another aspect which is often forgotten is ammo. How long does ammo stay good for if stored well?