Self-defense Guns Control Act Article 3

For security purpose, organizations and groups may request the local police departments to assign guards. If they need to be equipped with guns, an employee roster shall be submitted to the local police department for transfer to the Ministry of the Interior for approval; the number of guns shall not exceed 1/5 of the actual number of employees, except for departments responsible for public security tasks. Regulations governing applications for guns, allocation, licensing, and other relevant matters shall be prescribed by the Ministry of the Interior.
中文原文 自衛槍枝管理條例第3條
機關團體因警衛必要,得向當地警察機關請求派駐警衛,其有置槍必要者,應先檢同員工名冊,報由當地警察機關核轉內政部核准;其置槍數量,不得超過實有人數五分之一。
但負有治安任務之機關所需槍枝,得不受限制;其槍枝申請、配置、發照及其他應遵行事項之管理辦法,由內政部定之。

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