The Regulations Governing Permission and Management of Guns, Ammunition, Knives and Weapons Article 28

The central competent authority shall carry out at least a general inspection each year on all licensed firearms, ammunition, and knives; however, in order to maintain public safety, unscheduled general inspections may be implemented.
中文原文 槍砲彈藥刀械許可及管理辦法第28條
經許可之槍砲、彈藥、刀械,中央主管機關每年應至少舉行總檢查一次。
但為維護治安必要,得實施臨時總檢查。

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