When you say Connecticut can do nothing about noncompliance, that’s a matter of political will not being up to intentions. Their four-starred blowhard aka chief of state police made a threatening announcement that `we will go door to door & we will seize your unregistered guns & we will arrest you’.
A letter to that effect went out by the thousands so no room for `we were quoted out of context’. Nevertheless Malloy so believed that NRA members are violent & he so feared that shootouts with police would follow if he sent out his flying monkeys....that he did nothing. To this day.
At this point you are correct, they do not have the political will because they know the bloodbath that would result. But even if they had the will I don't know they could enforce it because there are many more armed gun owners than there are police. We have the bigger army by a very, very large margin. Thank goodness we and the NRA were able to hold off the gun grabbers until there were 300 million guns in the hands of Americans.