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Fired chancellor George Osborne bought his ammo at £1 a shot and headed for the biggest machine gun he could find, said fellow tourists.

Osborne’s 15-year-old son filmed his dad going Rambo, pulling the trigger on the heavy old weapon, believed to be an M60 used by US troops in Vietnam.

Firing at a rate of up to 650 rounds a minute, everyone in the waiting area jumped out of their skins as he blasted away, said one tourist.

The shamed ex-Chancellor has vanished from public view since suffering the humiliation of being fired by the new PM.

But he grinned after doing a bit of firing himself, 6,500 away in the former Viet Cong HQ, near Ho Chi Minn City.

(Image: Daily Mirror)

One Brit tourist said: “He really let rip.

“We were all having a bit of a laugh about it – that he was aiming at a picture of Boris Johnson or Theresa May!”

Another onlooker said: “We saw him in the queue waiting for bullets and then he went down to the range and fired the biggest machine gun they’ve got.

“It is one of those really, really big machine guns – the Rambo style one.

(Image: Daily Mirror)

“He queued up and paid a pound a bullet I think it costs. I couldn’t see how many he bought but it was several.

“His son went down with him but when I went down with our kids, we were actually told they weren’t supposed to go on to the range.”

Osborne’s choice of an action man holiday to the Cu Chi tunnels – which also feature torture equipment used by the guerilla fighters – is a world away from his new leader, Mrs May .

(Image: Daily Mirror)

She is on a gentle walking holiday in Switzerland while politicians like is old boss David Cameron enjoyed more traditional sunshine breaks.

The tunnels were the headquarters for the Viet Cong back in 1960s and 1970s in the war with America but have became a popular tourist attraction.

A British businessman who saw Mr Osborne there, said: “Above ground they have a firing range where you can fire Kalashnikovs and all sorts of other actual weapons from the Vietnam war.

“We were actually looking at the torture equipment and the booby traps when George Osborne suddenly came walking up behind us. It was bizarre to see Mr Osborne to be honest.

“I recognised him straight away,. I turned round and nudged a mate and said ‘look that’s George Osborne’.

“We were having a giggle about it – but we didn’t speak to him.

“You can fire either the AK47 and M16 which make a loud popping noise or the M60 which is the big one and is really loud.

“I managed to get a picture of George Osborne and his son heading down to the shooting area and his son already has his fingers in his ears.

“And then I filmed him firing the gun in a couple of short bursts.

“It’s a little dark but you can see the shell cases flying out of the gun.

(Image: Daily Mirror)

“He turns round grinning after he had finished his shooting.

“I was filming but my children said that when he fired the gun everyone in the waiting area jumped out of their skins!

"After that we just moved on and carried on with the tour. We even mentioned it to our tour guide but she didn’t recognise him either.

“We just thought it was all a little bizarre.

(Image: Daily Mirror)

“Cu Chi itself is quite a thought provoking place where some terrible things happened in the war.

“People were forced to live underground and there were some horrific casualties and injuries on both sides.

"We have been told there are still deaths and injuries every year due to the vast amounts of ordinance still left in the ground all around the area.”

Osborne was once a favourite to replace his close pal Cameron but the Brexit debacle ended his leadership ambitions.

(Image: Daily Mirror)

Earlier this week the Mirror revealed – when Osborne returns from his holidays – he will make a fortune from £50,000-a-time after-dinner speeches knocking audiences dead in America about his disastrous time as Chancellor.

The 45-year-old has signed up with public speaking agency the Washington Speakers Bureau and is already believed to be planning on spending one or two days a month giving lucrative speeches about the “political environment”.

He will call upon his six years at the Treasury where he slashed support for millions of struggling families while handing out huge tax breaks to the rich.

(Image: Daily Mirror)

But after his Brexit disaster he decided to take his family – including his two teenage children - away on a trip of a life-time to Vietnam.

They joined other holidaymakers for the trip to the famous Cu Chi tunnels

The 75-mile complex of tunnels at Cu Chi – on the outskirts of Ho Chi Minh City - has been preserved by Vietnamese authorities.

It is now a war memorial park with two separate tunnel display sites.

(Image: Daily Mirror)

The tunnels were the scene of several military campaigns during the Vietnam War.

And they were the Viet Cong’s headquarters for the notorious “Tet Offensive” in January and February 1968.

The American military coined the phrase “Black Echo” to describe the shocking conditions inside the tunnels.

For the Viet Cong soldiers who spent long periods of time in the tunnels life was almost unbearable difficult with air, food and water scarce.

(Image: Daily Mirror)

On its website the Cu Chi complex boasts of sport defence shooting among its list of entertainment activities.

The page says: “A thrilled sport with many visitors involved. Visitors will feel interested when testing their marksmanship in Defense Shooting playground.

"You can choose the appropriate type of gun used during the war, after the complete guide, you can try your shooting with animal-shaped and moving targets.”

(Image: Daily Mirror)

More sedate entertainment activities on offer at the complex include swan pedal boat rides , kayaking and a trip to a 4D cinema.”

It’s unclear how long Mr Osborne has been in the Far East.

There are no direct flights from the UK to Vietnam and tickets start at £2,500 a time in business class.

The Daily Mirror contacted Mr Osborne’s offices in both Westminster and his constituency Tatton but no-one was available for comment.

Vietnam - the war hell that bounced back as a holiday heaven

Few countries have changed so much over such a short time as Vietnam.

Just over 40 years after the savagery of the war with the US, this resilient, Communist nation welcomes foreign tourists with open arms.

Direct flights from London launched in 2011 made access easier for British tourists – lopping hours off a journey that had been only been possible via Bangkok or Singapore.

And last year the Vietnamese government relaxed its rules so British citizens staying 15 days or fewer do not need visas, saving them £54 on each visit.

(Image: Pham Khac/AFP/Getty Images)

Now more than 200,000 Brits visit every year, attracted by the exotic cities and the many stunning beaches.

Despite its rise in popularity in the last few years via package deals, Vietnam is still unspoiled and undeveloped.

It has yet to have the mass tourism seen in neighbouring Thailand and that means it has retained its charm.

From shimmering paddy fields to sugar-white beaches, beautiful pagodas to the moped-filled streets of capital Hanoi, Vietnam has something to offer all travellers.

And as the eurozone becomes more expensive post- Brexit , Vietnam offers great value for money. It was recently voted second cheapest holiday destination, beaten only by Cambodia.

While getting there is more expensive than travel to Europe, once you are there it is cheap as chips.

Beer costs just 50p a pint and £5 a day will easily cover food, transport and admission to attractions.