[Kip Russell]

At first glance I’m not sure how they intend to enforce this. looks like it has some holes in it to me.

Since these are registered guns...

1. Send out a letter such as the one in the OP.
2. If the gun owner doesn't comply after a short time (say, a month), contact him again and explain that if he doesn't comply, he will be in violation of the law.
3. Shortly thereafter, show up at his doorstep (with a SWAT team as backup) and order him to turn over his property.
4. If he resists, kill him.

[Above My Pay Grade]

>>>Since these are registered guns...

1. Send out a letter such as the one in the OP.
2. If the gun owner doesn’t comply after a short time (say, a month), contact him again and explain that if he doesn’t comply, he will be in violation of the law.
3. Shortly thereafter, show up at his doorstep (with a SWAT team as backup) and order him to turn over his property.
4. If he resists, kill him.<<<

In NYC, I think they would start with #4 and work their way back.