I see no legal way. I was born and raised in MD. and have lived in DE. for almost 50 years and when I go to MD I leave my gun locked up at home. Don't forget MD also will nail you if you are just carrying ammo in your vehicle.
They are the worst anti-gun state in America. And, of course, they are run by Liberal/Progressive Socialist. Gov. O'Malley wants to run for President of the United States? Not only no, but hell no!