A couple of bloggers have been wondering about some the details around concealed carry reciprocity, should HR822 eventually become law. (HR822, passed by the House a few days ago, established concealed carry reciprocity between states much like driver's licenses from one state are respected by all the others.)
If we're going to use the driver's license analogy, then why not take it all the way? A driver licensed in Kansas, for example, can drive a Kansas-legal car into any other state and operate it in a lawful manner even if that vehicle would be illegal or in technical violation in the other state. For example, a Kansas vehicle wouldn't have a front license plate, which is a technical requirement in many other states, but the Kansas driver of the Kansas-compliant car is expempted from the front plate requirement while visiting a state that requires it.
Similarly, that Kansas vehicle might not be legal to operate on the roads of another state if owned by a resident of that state, yet a Kansas driver visiting another state with that Kansas-licensed vehicle is grated a temporary exception and is allowed to operate that vehicle in the other states without additional license or penalty. An example of this is a car with 49-state emissions versus a California-compliant car. A Californian cannot buy a 49-state car and operate it in California, but a citizen of any other state can operate that same vehicle in California while visiting.
So, to bring this discussion back around to guns, I see no reason why folks would have to restrict themselves to 10-round (or fewer) pistol magazines, or handguns that are on California's "safe list." Of course, this assumes that HR822 is written in the same spirit as the law that provides reciprocity for driver's licenses--which probably isn't a safe assumption!