A GUN nut dressed in fatigues filmed himself walking into a US Walmart carrying an assault weapon and 100 rounds.

The man, described as white and aged in his twenties, was detained by an off-duty firefighter who held the suspect at gunpoint.

6 A gun nut filmed himself walking into a Walmart in the US carrying an assault weapon and 100 rounds Credit: KY3

The shocking display came less than a week after a twisted gunman used an AK47-type weapon to kill 22 people in a Walmart in El Paso, Texas.

It is the latest in a series of gun-related incidents that have been reported at Walmarts across the US since the massacre.

Cops say the camouflage-clad man walked into the Walmart in Springfield, Missouri, on Thursday and started pushing a shopping trolley around.

He was wearing body armour, military fatigues and was carrying tactical weapons.

Police say the man was recording himself walking through the store using his phone.

The store manager at the Neighborhood Market pulled a fire alarm, urging shoppers to escape the store.

Police say the man then made his way out of an emergency exit where a firefighter held the man at gunpoint.

At that moment Springfield Police arrived on scene and detained the man.

6 Cops say the man walked into the Walmart in Springfield, Missouri, and grabbed a cart before pushing it around the store Credit: KY3

The Springfield Police Department confirmed that the man had loaded weapons and more than 100 rounds of ammunition.

It comes one day after an unidentified man walked into a Florida Walmart shortly after 7pm on Wednesday and asked a clerk “for anything that would kill 200 people,” KIRO-TV reported.

“They announced over the intercoms for everybody to leave the store,” one shopper at the Port St. Lucie store told the station.

“One of the employees said there was a guy with a gun and that’s when everybody was running out.”

A store in Washington was evacuated on Wednesday afternoon when a man who appeared to have a gun walked in and threatened to open fire, KIRO-TV reported this week.

Police wouldn’t immediately say what threats were made and the department did not return a request for comment.

Early on Wednesday morning, a man was shot dead in the parking lot of a Walmart in Livermore, California.

Police said the suspect, Johnathon Michael Inocencio, 30, shot the victim in the torso at 4am then fled the scene in either a 2014 white Ford Explorer or a 2000 white and red Tioga motorhome.

Customers fled a Baton Rouge Walmart in panic on Tuesday when police said guns were drawn during an argument in the customer service line — initially reported to police as an active shooter.

The spate of troubling incidents have come after Patrick Crusius gunned down parents and kids in a packed Walmart in El Paso on Saturday.

The 21-year-old posted a horrifying anti-Mexican manifesto just 20 minutes before storming the store and mowing down those inside aisle-by-aisle.

He travelled 645 miles to the US border city of El Paso to carry out the massacre - which cops are treating as an act of domestic terrorism.

In his manifesto, titled The Inconvenient Truth and posted on messageboard 8chan, he cited book The Great Replacement, which promotes a racist theory that whites are being “replaced” by non-whites.

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Crusius said he supported the Christchurch shooter, who gunned down 51 Muslims in New Zealand in March, and said his attack was “in response to the Hispanic invasion of Texas”.

He wrote: “I’m simply defending my country from cultural and ethnic replacement brought on by an invasion. I can’t bring myself to kill my fellow Americans.”

The El Paso shooting — the eighth deadliest in US history — came 13 hours before a massacre in Dayton, Ohio, 1,500-miles away, which left 10 dead – including the shooter.

6 This is Patrick Crusius' mugshot - released by the FBI Credit: AP:Associated Press

6 This chilling CCTV image shows the gunman entering a packed Walmart supermarket in El Paso, Texas, before opening fire on families Credit: AFP or licensors

6 The Texas shooter has been identified as 21-year-old Patrick Crusius, pictured Credit: Rex Features

6 The 21-year-old, from Allen, Texas, was detained at the scene Credit: Rex Features