A Queensland grandmother who started a political party aiming to cut Muslim immigration and roll back gun laws says she's "heartbroken" after her son was charged over an alleged crime rampage.

Kim Vuga formed the Love Australia Or Leave party in 2016, after an unsuccessful Senate run as an independent in the Federal Election that same year.

Now, her 29-year-old son Jamie Madden is facing 15 charges after allegedly stealing cars at gunpoint and holding up three service stations - the last ending in a tense stand-off with police.

Pro-gun politician Kim Vuga says she is "heartbroken" over her son's alleged rampage. (A Current Affair)

Ms Vuga told A Current Affair she had watched the news footage from the alleged rampage dozens of times.

"I'm heartbroken, like I am truly, truly broken in a million pieces when it comes to being a mum," she said.

"I don't understand any of it. I can't believe any of it."

Jamie Madden, 29, has been charged after allegedly stealing cars at gunpoint and holding up three service stations. (A Current Affair)

The CCTV from inside the last service station Mr Madden is alleged to have held up also recorded sound, so it is possible to hear what went on during the stand-off with police.

"You're going to be my hostage for a little bit, I'm really sorry mate," the gunman is heard saying to an employee named Rob.

"It's your lucky day, isn't it."

The gunman can be seen interacting with servo employee Rob. (A Current Affair)

Ms Vuga, who has advocated for gun control laws to be repealed said she did not own a gun or even have a gun licence.

She said as far as she knew, her son did not have a licence either.

"Jamie hasn't been brought up around guns," she said.

Police were involved in a tense four-hour siege. (A Current Affair)

But the sight of her son allegedly brandishing a gun has not changed her belief that Australian civilians should be armed for self-defence.

"Had Rob at the service station, if he'd had a gun behind the counter and Jamie came up to him and Jamie was shot because of Jamie's own actions, it doesn't make a difference just because Jamie's my son, in regards to an outcome," she said.

"It doesn't make a difference at all."

Ms Vuga said she pleaded with Mr Madden to think of his daughters. (A Current Affair)

During the stand-off, Mr Madden demanded his mother's phone number from police.

Ms Vuga said she spoke to her son several times that night.

"I was talking about family," she said.

Ms Vuga formed the Love Australia Or Leave party in 2016. (A Current Affair)

"I was particularly talking about his girls, he's got three beautiful daughters and I begged him not to do what he was doing for their sake."

Mr Madden surrendered to police after four hours, with nobody hurt.

Ms Vuga said she blamed drugs for Mr Madden's alleged behaviour.

The party advocates for looser gun laws and restrictions on Muslim immigration. (A Current Affair)

"Those that are dealing and importing and exporting and moving large quantities around this country should receive, without a doubt, the death penalty," she said.

At this year's Federal Election, Ms Vuga's party scored just over 10,000 votes in the Senate.

She said she won't let Mr Madden's arrest deter her.

Ms Vuga said despite being pro-gun, she did not have a gun licence herself. (A Current Affair)

"If anything, I've got more reason to want to push, particularly our drug policy," she said.

"The firearms one is as it stands, and I'm not back-pedalling on that, and that's not because I'm getting my back up and saying, 'well, I'm not changing that'," she said.

But she denied she would be supporting her son when he faced court.

"I can't support him in anything he's done," she said.

"I can't even forgive him for what he's done."