Self-defense Guns Control Act Article 8

Foreigners residing in the Republic of China who wish to carry a gun for self-defense shall submit a letter of application together with the licensing fee and latest six recent 2-inch half-length front-view photos to a nearby embassy or consulate of their country for endorsement and guarantee, and then send to the local police department for inspection and licensing. If the foreign applicant with diplomatic status, the application shall be submitted to the Ministry of Foreign Affairs for transfer to the police department in the capital city for inspection and licensing.
中文原文 自衛槍枝管理條例第8條
居住中華民國境內之外國人,攜有自衛槍枝時,應備具申請書,連同照費,最近二寸半身正面脫帽照片六張,送由附近各該國使館或領事館簽註及具保,轉送當地警察機關審查給照;如係享有外交地位之外國人請領槍照時,應送由外交部轉首都所在地警察機關辦理。

English translation for reference only; the Chinese text prevails. Not legal advice.