Im Pro-Second Amendment: Change my Mind

I understand and fully respect the principles and rights outlined in the Second Amendment - as a matter of fact, I support them. I accepted the debate as I believe there is more that could be done to further lessen the casualties due to gun-related violence; for example, longer waiting periods for certain makes of assault rifles (maybe 3-5 days for more high-powered weapons, lesser waiting times for those which aren't as robust), yearly (or at least, on a regular scale i.e. every three/four years) training courses, and higher standards for the keeping of these weapons (under lock and key, or with a fingerprint scanner or input code - something that, in the event of an emergency, wouldn't significantly impact upon the time taken to protect yourself but also adds preventive strategy from mentally-ill people from hijacking your weapons and doing dangerous, unruly things - similar to the way you unlock your iPhone). All of these factors can allow authorities to more properly vet those people who are a genuine threat to society, whilst also allowing those who are responsible gun owners to continue to live their lives. What I'm trying to do here is find some middle-ground; a compromise. I am aware that there are already similar measures in place, such as background checks, waiting periods, and training courses - what I am proposing are just some more measures to spot the potential people who misuse these weapons and villainise the law-abiding citizens who use them properly; for self-defense, sport, hunting, and more. What we are seeing today happen in America is a significant increase in mass shootings - which, no matter what side of politics you are on, you can definitely agree is a bad thing. And because of strict rules on research and general toxicity around the gun-control debate in the U.S., we simply don't know whether or not it will truly help bring down mass murder and crime statistics. Other countries would point to tighter gun control rules as being able to help more than hinder, but until it is actually tested in the United States, we simply won't know. What this solution proposes is a system that allows law-abiding citizens to arm and protect themselves, to play sports, and go hunting - whilst also decreasing the safety risk for everyone in the general public form lunatics who misuse guns and commit terrible acts of violence and hatred. The government should absolutely not interfere with the Second Amendment by banning all guns; because then, as you said, tyranny could take over - which is why the 2nd Amendment was established in the first place (you know, with the higher tea price and all :P). But what they also shouldn't do is do nothing; because standing by when clearly there is a problem (the problem may not be guns themselves, but how easy it is for mentally ill people to access them) is most certainly not the right answer. Albert Einstein once said that the definition of insanity is doing the same thing over and over again and expecting different results. I'd be interested to see what you think of the points I've made; whether you agree or disagree, what you would change, or anything. (TL;DR: Guns should be able to be owned by law-abiding citizens, but there needs to be higher restriction to stop them from falling into the wrong hands.) :)