Time for gun law reforms in the USA?

[Mr Khan]

Kasz216 said:

Mr Khan said:

I've said before, these city-by-city bans won't work because of the loose laws within driving distance. It's easy to buy a gun legally elsewhere and simply drag it back into town. A nationwide ban would make it different.

Ok, but that doesn't explain why crime rates seem to go down when such laws are struck down as unconstitutional.

Is this a momentary trend, or one that persists over time?