Nor is it up to the legislatures. The only regulation of the trigger is done by the individual. They alone decide how, when, how often and how quickly it is cycled. The only thing the collectivists among us are capable of doing through the legislatures is to deny to the virtually 100% of the peaceful population of gun owners the enjoyment of their property in a never ending and ultimately unachievable goal of controlling the behavior of those they deem inferior to themselves.