Just remember that some NG and police officers confiscated weapons after Katrina. If VA or any other state wants the Guard to do this, it will. The state will find units that will blindly carry out it's orders with respect to gun confiscation. When it is over, soldiers will state they were "just following orders" as if that absolves them of any wrongdoing.
If it comes down to using the NG to enforce these state laws, the above is how it will go down. We've already seen it happen here in the US albeit on a small scale.
All of the "Molon Labe" crowd, how willing are you to kill uniformed soldiers and police officers?