You are correct - the 2nd amendment prohibits the US government from infringing the right to "to keep and bear arms" - it does not specify what kind of arms, so knives and swords (and theoretically but not actually) nuclear weapons would all be equally covered - supposedly as a check against tyranny, but this is not spelled out in the constitution, and sedition was made illegal about 10 years after the constitution was ratified.

My personal view, therefore is that the arguments for the 2nd amendment are a ridiculous fiction - as I imply above, US citizens can not actually build up an arsenal of weapons that would enable them to successfully challenge the US Government successfully (see Waco, Move, etc. - build up a big enough armory, you will be taken out).

So in my view gun rights only exist at this point to enrich arms dealers and give the citizenry an illusion of control, at the low, low cost of 80-something of our citizens per day.

It was in the Declaration of Independence, but not the constitution.