What are the limits of the second amendment?

I’m always annoyed when some lefty gun-banner throws out this bon mot: “Well, what are the limits, then?  Should people be able to buy rocket launchers?  Nuclear missiles?”

Just because I like to see their heads spin, I say “Certainly.”  I never bother to explain it to them because they are incapable of understanding.  But you?  You’re different.  I can tell.

Ralph (commenter at TTAG) gets it.

Basically, the Second Amendment was intended for two things – repelling an invading army over land, and overthrowing tyranny.  So if you look at it in the spirit in which it was written, at the very least it covers personal arms and crew-served weapons.  So yes, the Second Amendment would cover a howitzer.

The nuke issue gets tricky, but not for long.  See, nukes are VERY expensive.  And they aren’t safe to be around, so on a private property rights basis most people won’t be able to keep them in their residence.  And they’re useless without some kind of delivery system.

So we’re talking a couple BILLION dollars to have one nuke with the ability to use it (excepting suicide bombers, but hey, how likely is that given how big a nuke is?).  So there’s maybe a dozen people in the world who could afford it.  And they all have a vested interest in the world not getting nuked.  No, the real threat of nukes is from nations like Iran and North Korea with nothing to lose.

So I think I can say with 100% confidence that there ought not be any limits on the second amendment.  Anything our infantry can carry and use should be on the shelves at the local gun shop.