Citation(s) from the GunPolicy.org literature library
State of Maryland. 2012 ‘Md. Code Ann., Pub. Safety § 5-101(r), etc..’ Firearms Law Database - Private Sales in Maryland. San Francisco, CA: Law Center to Prevent Gun Violence. 3 January
Private Sales in Maryland
Private firearms sellers (persons who are not licensed dealers) must process transfers of "regulated firearms" (handguns and assault weapons) through a licensed dealer or designated law enforcement agency.
In addition, no regulated firearm transfers may be made to any person whom the private seller knows or has a reasonable cause to believe is a prohibited purchaser under state law…
Private sales of standard rifles and shotguns are not required to be processed through a licensed dealer, and purchasers are not subject to background checks…