Not true. You can buy rifles and shotguns in any adjoining state as long as you follow the regulations of the state in which the buyer resides.
You can only sell pistols across state lines if it is an FFL to FFL transfer. The recepient FFL boes the backgrround (NCIS) check and any other related paperwork.
If you are a Maryland resident, you can buy non-regulated long guns face-to-face in Virginia.
Regulated firearms must be transferred to a Maryland FFL who will charge you a transfer fee, do the background check, fill out the necessary Federal and State forms and submit them to the MSP, charge you additionally for those and secure the firearm for the mandatory 5 day waiting period.
Correct. I should have said "handguns," not "guns."