Maryland Code, Criminal Law § 5-622

(1) a handgun, antique firearm, rifle, shotgun, short-barreled shotgun, and short-barreled rifle, as those words are defined in § 4-201 of this article;

(2) a machine gun, as defined in § 4-401 of this article; and

(3) a regulated firearm, as defined in § 5-101 of the Public Safety Article.

(1) a felony under this title;

(2) a crime under the laws of another state or of the United States that would be a felony under this title if committed in this State;

(3) conspiracy to commit a crime referred to in items (1) and (2) of this subsection; or

(4) an attempt to commit a crime referred to in items (1) and (2) of this subsection.