You think that's bad. In England, merely defending yourself at all can cause you to be arrested. Defending yourself in any school in the US may cause you to be handcuffed and charges filed.
I'd say your options are (though I'm speaking hypothetically and not advising any of these):
1. Have the friend come to Va, or SkyPE
2. Seek other tools for SD
3. Stay out of trouble
4. Ship the firearm to your friend or use the one he has in his home
I think you could be stopped and have any firearm seized in MD, despite the, um, length or method of storage, if the LEO wanted to push it. Why risk it?