From Reason:

So how has that worked out? Well, according to the National Shooting Sports Foundation’s conservative estimate, New Yorkers owned about 1 million “assault weapons” at the time the ban was passed. So the 44,000 that were actually registered are about 4 percent of the total. This noncompliance with the law is widespread and mostly open, but the police aren’t doing much about it.

I could give several more examples of such reporting. But the upshot is that gun owners are overwhelmingly ignoring the law—and the police are overwhelmingly looking the other way.