Ammunition and magazine laws in Maryland

(a) This section does not apply to:
(1) a .22 caliber rifle with a tubular magazine; or
(2) a law enforcement officer or a person who retired in good standing from service with a law enforcement agency of the United States, the State, or any law enforcement agency in the State.
(b) A person may not manufacture, sell, offer for sale, purchase, receive, or transfer a detachable magazine that has a capacity of more than 10 rounds of ammunition for a firearm.
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(d) (1) A person may not sell, rent, or transfer:
(i) ammunition solely designed for a regulated firearm to a person who is under the age of 21 years; or
(ii) 1. a firearm other than a regulated firearm to a minor;
2. ammunition for a firearm to a minor;
3. pepper mace, which is an aerosol propelled combination of highly disabling irritant based products and is also known as oleo–resin capsicum (O.C.) spray, to a minor; or
4. another deadly weapon to a minor.
(2) A person who violates this subsection is guilty of a misdemeanor and on conviction is subject to imprisonment not exceeding 1 year or a fine not exceeding $1,000 or both.

(d) (1) A person may not sell, rent, or transfer:
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2. ammunition for a firearm to a minor;

(x)(1) It shall be unlawful for a person to sell, deliver, or otherwise transfer to a person who the transferor knows or has reasonable cause to believe is a juvenile—
(A) a handgun; or
(B) ammunition that is suitable for use only in a handgun.
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(5) For purposes of this subsection, the term "juvenile" means a person who is less than 18 years of age.

Small Arms Ammunition: Ammunition is classified as a Division 1.1, 1.2, 1.3, or 1.4 explosive, depending on the degree of hazard. Ammunition that is regulated as a Class 1 explosive and designed to be fired from a pistol, revolver, rifle, or shotgun, as well as associated primers and blank cartridges (including those designed for tools) and propellant powder for use in any firearm, is prohibited from mailing.
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Shotgun Hulls, Empty Casings, Nonmetallic Shotgun Hulls, or Casings Without Primers: These articles are not classified as explosives or hazardous materials under 49 CFR and, therefore, are mailable, subject to the applicable mailing rules (refer to 224).