To ensure compliance with Australian customs and firearms regulations, it's important to declare any disassembled air gun components upon arrival. It is advisable to check with the Australian Border Force (ABF) or the Australian Customs and Border Protection Service (ACBPS) for specific regulations and requirements related to importing disassembled air guns. You can find their contact information or visit their official website for more details.
Additionally, some states and territories in Australia may have their own specific laws and regulations regarding the possession, use, and importation of air guns. Therefore, it's essential to research and understand the local laws and regulations in the state or territory where you intend to bring the disassembled air gun.