And if you chose to interpret it like that it still falls under the 10th Amendment and firearms would still be legal. And no it's not a gross stretch beyond intent, it was put there to protect the citizenry and their liberties. Liberal policies of gun control have already failed in many areas of the US with high minority populations, the most notorious being Washington D.C and Chicago. Outright banning firearms would not only be illegal but it would not be tolerated by an even larger majority who would simply refuse to comply.
That entirely depends on how much pressure the NRA ect would have on state legislature. Some states may enforce it, some wouldn't.
Sure it was. But as I stated, in no way is what the US has now, a well regulated militia. Arguing otherwise is just daft. So that part has blatantly been ignored.
If they refuse to comply they break the law. And if they break the law they are charged with whatever offences and dealt the punishment. But in no way would banning them, other than in controlled and regulated militias, be illegal.