“just how would they enforce it?”
They can’t, and they know it. They’re counting on 100,000,000 Americans (the largest armed force on earth) to be good little sheeple, and willingly relinquish their rights.
It’s a complete fantasy.
Keep your eye on California, Governor “Moonbeam” Brown just signed a whole boatload of anti-gun crap into Law making this State the HOTTEST front in RKBA preservation.
We’ll see how “hot” it gets when LEO has to try to enforce this @#$@#.