22/11/2016 8:29 AM AEDT | Updated 22/11/2016 10:44 AM AEDT

Gun Laws Separate The Coalition As Nats Cross The Floor

And the detractors are backed by Deputy Prime Minister Barnaby Joyce.

Alex Ellinghausen, Fairfax
Nationals Senators Bridget McKenzie and John Williams cross the floor

CANBERRA – Moves to strike down a ban on a controversial shotgun have been tried and failed in the Senate, but not before the unusual sight of a seeming rupture within the Liberal/National Coalition Government.

It came during a marathon sitting of the Senate which finally saw the passing of one of the bills which triggered the July double dissolution election, the Registered Organisations Bills.

Not a single Nationals senator voted for the Government's position on the measure proposed by crossbencher David Leyonhjelm which would allow the importation of the seven shot, rapid-fire, lever-action Adler shotgun.

Two Nationals senators Bridget McKenzie and John "Wacka" Williams crossed the floor and voted with Leyonhjelm and One Nation, while three Nationals ministers, Fiona Nash, Nigel Scullion and Matt Canavan -- along with backbench Nationals senator Barry O'Sullivan -- abstained from voting.

The move was easily defeated 45-to-7 with Labor and the Greens voting with Liberal Senators.

What is the debate about the Adler shotgun?

A temporary ban was placed on the seven-shot, lever-action shotgun in 2015

A magazine can be emptied in a matter of seconds

It can fire seven rounds with capacity for an eighth

Proponents want it help deal with feral animals

Opponents say it is too powerful and could end up in the wrong hands

Alex Ellinghausen, Fairfax
Senators John Williams, Nigel Scullion and Barry O'Sullivan do 'speak no evil, see no evil, hear no evil' poses during debate in the Senate

Deputy Prime Minister and Nationals Leader Barnaby Joyce -- who has his own history with crossing the floor -- stands by the right of his Upper House colleagues to vote against the government.

"I have had discussion with both Wacka and Bridget, but I respect their rights," he told reporters in Canberra.

"They gave cogent arguments as to why they believe the way they do."

"They claimed a clear belief that they had a deal with Leyonhjelm and they were going to stick to it."

Both McKenzie and Williams said they support Australia's current gun control laws and claim the seven shot Adler shotgun won't weaken them.

Joyce has indicated there may be a price to pay for McKenzie and Williams, who has announced earlier this year that he will not be contesting the next election.

"People know there is a price, obviously, if you are in the executive it costs you your job," he said.

"They have got their right. I understand their reasoning. They expressed it and long may that be the way."

The Huffington Post Australia understands that price may be a pause on promotions for two years.

Deputy Labor Leader Tanya Plibersek sees it as a Coalition in chaos.

"This is a government at war with itself and Malcolm Turnbull is too weak to assert his authority over the Coalition partners in the National Party," she told reporters in Canberra.

"I think it also shows that the Nationals are desperately worried about the results they saw in the Orange by-election in New South Wales."

"We know that the concerns within the National Party - that they have not been representing bush communities - are coming home to roost now."