I’m an avid gun-owner AND strongly in favor of draconian gun control laws. I’ll just add a couple extra comments in response to Dangerosa’s and Dr. Deth’s suggestions…
One of the reasons the 2a die-hards argue against this is because gun registration was used against the general populace in (relatively) recent history. It’s also the reason they invariably sing “If guns are criminalized, only criminals will have guns.”
The example is right next door – southward instead of north. My brother-in-law revealed a bit of Mexican history to me: There was mandatory gun registration and then, at some point, the government used those registries to go around and collect the guns from non-LEO/Non-military people. Then it made private gun ownership illegal for non-LEO/Non-military people.* Now, the only civillians with guns in Mexico are connected to drug cartels.
I let my insurer know I own a gun. My agent told me it didn’t affect my rates, but loss would be covered like any other object in the house and any injury from it (or its projected lead slugs) on the property would be covered like any other accident liability. If the matter wasn’t an accident…well, such matters would be dealt with (if necessary) according to routine insurance procedures, as well. In other words I already have liability coverage in case someone is injured by (bullet(s) from) my gun. It costs me nothing extra.
One of the reasons we’re required to notify police if a gun is stolen/lost is so they can affix a date to that loss. If it turns out your stolen/lost gun is used after that date, you can be considered less-of-a-suspect in the crime. 
California also has laws making a minor’s use of a gun reflect on the gun owner. I don’t believe it has actually been invoked, probably since the owner has (usually? always?) been the parent of the subsequently-deceased gun-using child.
I must admit I’ve never looked into the laws outside of California. Here on the (majority of the) left coast, all exchanges or sales of firearms must be handled through a Federally-Licensed Firearms dealer, who records the names and ID’s of the seller and the buyer and charges a fee. One can even call around and find the lowest transaction fee to arrange for transfers to be recorded as cheap as possible.
I remember reading an article in which a gun store owner was complaining that the annual records audit by the ATF took a whole weekend, during which he had to keep his shop closed because he couldn’t [COLOR=navy]do any transfers and wasn’t willing to focus on anything else (lest it take even longer). The article then revealed that the process is such a pain in the ass because the NRA insists that the records-of-transfer cannot be computerized. See #1, above, for their reasons.
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A) Changing the purchasing age will have little effect on the number of guns already in homes. In fact, the kids shooting up schools seem to be using guns owned by their parents and acquired without permission (see #3 above)
B) [COLOR=navy]Even the NRA has thrown its hallowed opinion against bump-stocks. Maybe it will become illegal to sell them but, now that the idea is out there, home-made versions can’t be stopped. [Like modifying S/B/A switches on military replica rifles].
C) Magazine capacity really isn’t much of an issue. Somewhere around here is a thread in which I brag about my ability to speed-swap my magazines without breaking rhythm; it’s not hard to learn/practice and analysts were saying the Columbine kids were doing it twenty years ago.[/COLOR]
Wow!
Umm…rather harshly illuminating review of LEOs, Scumpup. Thank you for the education, even though it kinda squished my ‘hero worship’ of law enforcers. Ignorance fought!
Lastly, “gun lethality” is actually more a matter of the person shooting rather than the gun itself. You might understand that a bigger bullet would inherently kick the gun harder. For most people that would intuitively mean a gun using a smaller bullet# – a .22 or a .25, for instance, would be ‘less deadly.’ For most people, though, a lighter kick means greater accuracy. So is it the heavier bullet capacity or the greater accuracy which is more lethal?# And, for me and probably a lot of other enthusiasts, there’s an irony in that I shoot more accurately with a .45 than with a .40 or .38 handgun so I, in particular, am more lethal with the bigger slug – which confirms the intuition but is counter to what most knowledgable shooters understand about basic handgunning.
—G!
*This law had some news- and entertainment-generating effects on the career of DOG the Bounty Hunter, who was noticed by producers and signed on to a TV show after he went down to Mexico – with guns – to hunt for the famous Max Factor Serial Rapist/Killer and drag him back to U.S. soil.
#And the really knowledgable gun users can take the discussions of .45 vs 9mm and .223 vs .308 vs 7.62mm vs 5.56mm to completely different boards where such things are not beyond the understanding of the majority of participants. Yeah, I’ve read and watched and contemplated and I have my own opinions, but all of that is a major tangent to this particular thread.