§ 7–2502.02(Perm). Registration of certain firearms prohibited.
(a) A registration certificate shall not be issued for a:
(1) Sawed-off shotgun;
(2) Machine gun;
(3) Short-barreled rifle;
(4) Pistol not validly registered to the current registrant in the District prior to September 24, 1976, except that the prohibition on registering a pistol shall not apply to:
(A) Any organization that employs at least one commissioned special police officer or other employee licensed to carry a firearm and that arms the employee with a firearm during the employee’s duty hours;
(B) A police officer who has retired from the Metropolitan Police Department;
(C) Any person who seeks to register a pistol:
(i) For use in self-defense within that person’s home or place of business; or
(ii) As part of the application process for a license to carry a concealed pistol pursuant to § 7-2509.02; or
(D) A firearms instructor, or an organization that employs a firearms instructor, for the purpose of conducting firearms training.