A US woman who flew to Australia with a gold-plated pistol in her luggage has been sentenced to a year in jail, despite claiming she brought it with her for protection.

Liliana Goodson pleaded guilty to charges of illegally importing an unauthorised firearm and illegally importing ammunition.

On Monday, the 30-year-old was sentenced in Sydney’s Downing Centre local court to the 12-month jail term, of which four months will be served in full-time custody.