The Turkish Adler A110 lever-action shotgun is available to buy in Australia after the manufacturer was able to bypass a year-long ban imposed on such weapons in the wake of the Sydney siege last year.

The ban is aimed at weapons that can shoot more than five rounds without reloading.

A previous model of the Adler had the ability to fire eight rounds without reloading, but it has been banned and replaced by a new version of the gun with a five-round capability.

The revised feature means the weapon fits within the National Gun Agreement's importation guidelines.

In Parliament on Thursday, Greens police spokesperson Rosalie Woodruff said an amendment to the Firearms Act was necessary to protect the public from the Adler.

She claimed the firearm had the ability to shoot up to six rounds in as many seconds.

"It goes without saying that if a person were to enter a confined space and fire six rounds at close quarters, the result would be catastrophic," Dr Woodruff said.

"There wouldn't be an opportunity for defence until all the rounds in the gun had been fired."

Police Minister Rene Hidding said the Greens' push for an amendment to the act had been noted.

"It is expected that this matter will be resolved well ahead of the expiry of the current Adler import ban mid next year," he said.

"We take very seriously our commitment to ensure that firearms are appropriately regulated.

"All states are currently working through a national approach to consider the appropriate categorisation of the Adler firearm through the Law, Crime and Justice Council of COAG."