Earlier quoted context omitted.
Knives, nunchucks, brass knuckles, etc. are usually covered by state level laws, from what I've seen, and the legality varies widely. Firearms are a slightly different story, since the 2nd Amendment very specifically protects firearms ownership. So yes, it is possible that somewhere or other, a switch blade knife is illegal while an "assault rifle" is legal. I saw "assault rifle" in quotes, because most people talkin…
since the 2nd Amendment very specifically protects firearms ownership I've seen folks use that rationale, but the 2A doesn't say "firearms" it says "arms" - presumably "knives, nunchucks, brass knuckles, etc" would fall under that, although that's clearly not how it's been interpreted.
Come to think of it, I don't know why that is, and I'm not arguing that it's correct.
Anyway, the real point is that there seems to be a lot more variation in laws concerning the legality of owning knives, nunchucks, brass-knuckles, etc., than there is about guns. Guns may be more highly regulated in general, but I don't know of a single state where private ownership of, say, a pistol, is illegal. But I'm pretty sure there are states where switch-blade knives are. But I'm working off memory here, so maybe I'm wrong.