By virtue of MD Pub Safety Code § 5-106, any person involved in the sales of a firearm must be permitted by law to do so, i.e. must be someone with a license to do so.
By virtue of MD Pub Safety Code § 5-133, an individual can neither buy nor own a firearm if he/she:
has been declared guilty of a crime that automatically hinders his access to firearms;
has been declared guilty of a crime that has an imprisonment term of more than two(2) years and is also regarded as a common law crime;
is wanted for a crime committed;
is a drunk who has made it a habit to always be drunk;
is an addict or constant user of hard drugs or dangerous substance;
is, by virtue of § 10–101(i)(2) of the Maryland Health General Code, considered insane or mentally unstable and, has caused harm or injury to another person in the past;
is not qualified to stand trial by virtue of § 3–106 of the Criminal Procedure Article;
is, by virtue of the Maryland Criminal Procedure Code: § 3–110, considered criminally irresponsible;
has been (by his own will) in a medical facility as defined in § 10–101 of Maryland Health General Code, for over thirty (30) days;
Is in rehabilitation; see § 10–101 of the Maryland Health General Code;
is cared for by a guardian arranged for him by a law court; see § 13–201(c) or § 13–705 of the Estates and Trusts Article. This law stands with exception in cases where such arrangement was done as a result of the person being physically unfit (disabled) to care for himself;
(excluding what is stated in subsection (e) of this section) has been accused and has:
an admissible CPO (also known as civil protective order) filed against them by virtue of what is contained in § 4–506 of the Family Law Article; or
a protection order given by a court of a different state; see § 4–508.1 of the Family Law Article for protection order;
(who was not up to 30 years when a firearm was found in his hold) has been found guilty of committing a criminal offense, by a juvenile court; such an offense that if committed by an adult would be regarded as; a violent crime, a felony, or a misdemeanor with an imprisonment term of more than 2 years (these crimes are also called disqualifying crimes).
A Handgun Qualifications License: this is issued by the State Police in Maryland, and any person who intends to buy a gun must have it before buying the gun.
In accordance with MD Pub Safety Code § 5-303, any person with the intention to bear hidden firearms must own and have in his possession a Handgun Wear and permission to carry a firearm.
To make applications for permission to carry a gun, the person applying must be at least eighteen (18) years of age and must follow the steps below to be eligible.
The person must have gone through and concluded an acknowledged training course for handguns.
He/she must submit their biometrics; majorly their fingerprint.
The person must submit a colored passport photograph of himself/herself.
The person must make an application for this permit via the Licensing Portal of the Maryland State Police.
Make appropriate fee payment. This fee is called the filing fee.
The Maryland State Police will give or refuse approval to this application within a ninety-day period after it was received.
Maryland does not give recognition to the permission of any other state to carry hidden firearms. Also, there is no statute that makes mention of or supports reciprocity.