Australian modifications — state-by-state quick reference

Each state's firearms registry has its own rules and policy memos. This is a starting reference — the linked source documents are authoritative.

NSW

• Modifications to "alter the category" of a firearm are prohibited without prior approval (NSW Firearms Act 1996).
• Magazine capacity for shotguns: 5 rounds. Rimfire semi-auto: 10 rounds (Cat C only).
• NSW Firearms Registry

VIC

• Victoria Police Licensing & Regulation Division requires a Form 27 to modify any firearm.
• Mag-capacity limits and configuration rules are enforced strictly.
• Victoria Police Firearms

QLD

• Queensland Weapons Act 1990. Approval needed before any modification that may affect category.
• Queensland Weapons Licensing

WA

• WA Police Firearms Branch operates under the Firearms Act 1973 and the Firearms Regulations.
• WA Police Firearms

SA

• Firearms Act 2015 (SA). SAPOL requires the registered firearm details to remain consistent — significant modifications require notification.
• SAPOL Firearms

TAS, ACT, NT

• Each follows the National Firearms Agreement framework with state-specific paperwork. Contact your registry before modifying.