This might sound crazy but apparently Maryland actually allows open carry of long guns.
Taken from page 7
B. Maryland Does Not Require a Permit to Wear and Carry a Long Gun Outside the Home.
Outside of limited exceptions, Maryland does not require a permit to wear and carry a long gun outside the home.
Maryland prohibits carrying any firearm on school property, Md. Code Ann., Crim. Law § 4- 102; on government property, COMAR 104.05.01.03B; at state airports and ports, COMAR 11.03.01.03-1I, COMAR 11.03.02.08C(1), COMAR 11.05.07.04B4; and in or very near public places during a public demonstration, Md. Code Ann., Crim. Law § 4-208.
This is shocking and weird!