Citation(s) from the GunPolicy.org literature library
State of Maryland. 2012 ‘Md. Code Ann., Pub. Safety §§ 5-123(a), etc..’ Firearms Law Database - Waiting Periods in Maryland. San Francisco, CA: Giffords Law Center to Prevent Gun Violence. 3 January
Waiting Periods in Maryland
In Maryland, any person, whether a licensed dealer or private seller, who sells, rents or otherwise transfers a "regulated firearm" (handgun or assault weapon) may not transfer the firearm until seven days have elapsed following the time a prospective purchaser completes an application to purchase a regulated firearm, and the application is forwarded to the Secretary of the Maryland State Police.
There is no waiting period for the transfer of a rifle or shotgun (except for an assault weapon) in Maryland…