; sec. 1–303.43, D.C. Official Code), is amended by adding at the end the following: Nothing in this section or any other provision of law shall authorize, or shall be construed to permit, the Council, the Mayor, or any governmental or regulatory authority of the District of Columbia to prohibit, constructively prohibit, or unduly burden the ability of persons not prohibited from possessing firearms under Federal law from acquiring, possessing in their homes or businesses, carrying, transporting, or using for sporting, self-protection, or other lawful purposes, any firearm neither prohibited by Federal law nor subject to chapter 53 of the Internal Revenue Code of 1986 (commonly referred to as the National Firearms Act ). The District of Columbia shall not have authority to enact laws or regulations that discourage or eliminate the private ownership or use of firearms for legitimate purposes. . 4. Repeal of D.C. semiautomatic ban Section 101(10) of the Firearms Control Regulations Act of 1975 (sec. 7–2501.01(10), D.C. Official Code) is amended to read as follows: (10) Machine gun means any firearm which shoots, is designed to shoot, or can be readily restored to shoot, automatically more than one shot, without manual reloading, by a single function of the trigger. The term machine gun shall also include the frame or receiver of any such firearm, any part designed and intended solely and exclusively, or combination of parts designed and intended, for use in converting a firearm into a machine gun, and any combination of parts from which a machine gun can be assembled if such parts are in the possession or under the control of a person. . 5. Repeal of registration requirement and authorization of ammunition sales (a) Repeal of requirement (1) In general Section 201(a) of the Firearms Control Regulations Act of 1975 (sec. 7–2502.01(a), D.C. Official Code) is amended by striking any firearm, unless and all that follows through paragraph (3) and inserting the following: any firearm described in subsection (c). . (2)