Self-defense Guns Control Act Article 11

Licenses for self-defense guns are valid for 2 years, and upon expiration must immediately be surrendered and a new license may be applied for.If any of the following conditions occur within the term of the license, the self-defense guns shall be purchased by the special municipal or county (or county-level city) government:1. The holder has been sentenced to fixed-term imprisonment or more severe punishment, and the sentence has been confirmed.2. The holder is incapable of using guns due to mental aberration or accidents.3. Continued possession of guns by the holder presents a potential public security risk due to the holder’s misbehavior, accidents within the family, or serious disputes between the holder and others.If a self-defense gun is used to commit a crime, the weapons and ammunition on the scene as well as the bullets kept in other places shall be confiscated.
中文原文 自衛槍枝管理條例第11條
自衛槍枝執照限用二年,期滿應即繳銷,換領新照。
前項自衛槍枝持有人,在限期內有左列情形之一者,其槍枝應由直轄市、縣(市)政府給價收購:
一、判處有期徒刑以上之刑,經確定者。
二、精神失常或因其他事故無使用槍枝能力者。
三、行為不檢或家庭發生變故或與他人發生重大糾紛,持有槍枝有危害社會治安之虞者。
持用自衛槍枝犯罪者,現場之槍彈及留存非現場之子彈,全部沒收之。

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