Michael Greenough wrote: "We need a national set of firearm regulations instead of 50 different, and confusing ones"
Very true.  Most people do not realize that it is legal to declare and check a firearm and ammunition as baggage on an airline, and fly to your destination.  But a problem arises if you need to stay overnight in a place like California on the way to your destination.  If your firearm is of the "wrong" shape, or the magazine is of the "wrong" capacity, you are in violation in that state.  Not conducive to interstate commerce.