(a) Article 4 (commencing with Section 31900) and Article 5 (commencing with Section 32000) shall not apply to a single-action revolver that has at least a five-cartridge capacity with a barrel length of not less than three inches, and meets any of the following specifications:
(1) Was originally manufactured prior to 1900 and is a curio or relic, as defined in Section 478.11 of Title 27 of the Code of Federal Regulations.
(2) Has an overall length measured parallel to the barrel of at least seven and one-half inches when the handle, frame or receiver, and barrel are assembled.
(3) Has an overall length measured parallel to the barrel of at least seven and one-half inches when the handle, frame or receiver, and barrel are assembled and that is currently approved for importation into the United States pursuant to the provisions of paragraph (3) of subsection (d) of Section 925 of Title 18 of the United States Code.
(b) Article 4 (commencing with Section 31900) and Article 5 (commencing with Section 32000) shall not apply to a single-shot pistol with a barrel length of not less than six inches and that has an overall length of at least 10½ inches when the handle, frame or receiver, and barrel are assembled.