Impractical to ban guns from the US. Nearly 400million guns, an underground market would appear surely if guns were banned. Many businesses out of business. And all the believers in the 1st & 2nd amendments, small government, against tyranny etc.
The idealistic ways of the founders worked largely with small populations but now a large diverse population arguably has nullified parts of the constitution as need bigger government and central/state authority to control any problems such as gang violence, drugs, and other groups, look at the bikers for example.