The "Laboratories of Democracy" idea is unrealistic for firearms, and most issues. States don't control their borders. Though, it's against federal law to buy a handgun from an FFL out of state and a long gun can only be purchased out of state if said long gun is legal in a buyer's home state.
In general, do you think that gun crimes (e.g. possession of a firearm by a felon) are adequately prosecuted?
I'm not interested in talking about the US Constitution. We both already know each other's arguments. I'm not even interested in changing your opinion. I'm a lurker, but I've read your comments for years and respect you.
The logistics of your ideal scenario interest me. Canada gave up on registering long guns because it was infeasible.
Would you support a law requiring background checks for all purchase of firearms under the condition that the National Instant Criminal Background Check System (NICS) is made available for all citizens to use (not just FFLs), free of charge, using a driver's license number of the potential purchaser?
Do you think that the progression of low-cost CNC machines, such as the Ghost Gunner, is a hurdle for the gun control measures that you want implemented?
The serialized lower receiver is what is considered a firearm in America. Do you want to regulate all firearm components, such as barrels, handguards, etc?