Maryland Criminal Law Section 4-209

      (a)      Except as otherwise provided in this section, the State preempts the right of a county, municipal corporation, or special taxing district to regulate the purchase, sale, taxation, transfer, manufacture, repair, ownership, possession, and transportation of:

            (1)      a handgun, rifle, or shotgun; and

            (2)      ammunition for and components of a handgun, rifle, or shotgun.

      (b)      (1)      A county, municipal corporation, or special taxing district may regulate the purchase, sale, transfer, ownership, possession, and transportation of the items listed in subsection (a) of this section:

                  (i)      with respect to minors;

                  (ii)      with respect to law enforcement officials of the subdivision; and

                  (iii)      except as provided in paragraph (2) of this subsection, within 100 yards of or in a park, church, school, public building, and other place of public assembly.

            (2)      A county, municipal corporation, or special taxing district may not prohibit the teaching of or training in firearms safety, or other educational or sporting use of the items listed in subsection (a) of this section.

      (c)      To the extent that a local law does not create an inconsistency with this section or expand existing regulatory control, a county, municipal corporation, or special taxing district may exercise its existing authority to amend any local law that existed on or before December 31, 1984.

      (d)      (1)      Except as provided in paragraph (2) of this subsection, in accordance with law, a county, municipal corporation, or special taxing district may regulate the discharge of handguns, rifles, and shotguns.

            (2)      A county, municipal corporation, or special taxing district may not prohibit the discharge of firearms at established ranges.