Kansas

It is a common practice in law...Both federal preemption and state preemption are often enacted to stop patchwork of legality.

Oh, most of Kansas gun laws were already preempted. Open carry has been legal in all but Shawnee, Douglas, Johnson, and Sedgwick (And maybe Leavenworth and Wyandotte) for as long as I've lived here. Every year there are a few people who didn't know that it was prohibited in those counties who are arrested. I see nothing wrong with preemption of these laws other than there are certainly more urgent and important issues which could use the attention of law makers.