I gave several examples in post #4. But I’ll enumerate some more here:
[ol]
[li]Make background checks include psychiatric history and other relevant data rather than just criminal records[/li][li]States could mandate that gun owners be subject to licensure and that they must pass reasonable safety tests[/li][li]Regulate private sales of semi-autos, so everything has to go through a licensed dealer who will do background checks and maintain records. (So-called “gun show loophole.”) [/li][li]Adequately fund law-enforcement so existing regulations regarding licensed gun dealers are actually enforced[/li][li]States could mandate that gun owners carry liability insurance (the policy would list each gun you own, like car insurance. (This also has the added benefit of establishing another paper trail.))[/li][li]Start holding people liable for knowingly failing to report stolen weapons[/li][li]Improve mandated-reporting laws so weapons can be temporarily confiscated (with due process) from people with psychiatric problems[/li][li]Require gun manufacturers to include better tamper-resistance for serial numbers, e.g. by including RFID chips within the receiver body[/li][/ol]
All of these ideas are fully compatible with the 2nd Amendment and (to my understanding) existing case law. Some of them are just enforcing laws that we already have, others could probably be done through regulations without even needing new legislation. Many of them (like owner licensure and insurance) could be implemented by states with new legislation. Regulating private sales would require federal legislation.
Now, if your goal is to ban guns completely, then yes, you would have to remove the 2nd Amendment entirely. But I don’t think that’s a good or reasonable goal, and I don’t think you’d find much support for it even amongst people who don’t like guns.
OTOH, I think reasonable reforms like the above ideas could significantly reduce gun violence and actually have a chance of becoming policy if we can move past the NRA slippery-slope rhetoric.