Regulations Governing Permission and Management of Homemade Hunting Guns and Spear Guns of Indigenous Peoples and Fishermen Article 5

The structure of a homemade spear gun consists of a firing mechanism, gripping device, and rubber components. It propels sharp objects by using rubber elasticity to catch aquatic animals and shall not use gunpowder or other explosives to generate the propelling force.
中文原文 原住民漁民自製獵槍魚槍許可及管理辦法第5條
自製魚槍之構造,由發射機構、持握裝置及橡皮組合而成,藉橡皮彈力發射尖銳物採捕水產動物,不得以火藥等爆裂物為發射動力。

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