Md. Code, Pub. Safety § 5-147

(a) In this section, “Department” means the Department of State Police. (b) (1) The Department shall transmit to each e–mail address on file with the Department that is associated with the purchaser or transferee of a regulated firearm or a person who has registered a regulated firearm with the Department a summary of each new law or change to each existing law pertaining to firearms that was passed by the General Assembly during each legislative session as provided in paragraph (2) of this subsection. (2) The summary described in paragraph (1) of this subsection shall be transmitted: (i) within 45 days after the General Assembly adjourns Sine Die in a legislative session; (ii) for each act establishing a new law or change to an existing law pertaining to firearms, 30 days before the effective date of the act; and (iii) if an act is designated as an emergency act, as soon as practicable.