A Second Amendment supporter has posted a video in which he destroys his AR-15 rifle in response to the Florida school shooting.

Scott Pappalardo said he said he could not live with the idea the child of its next owner might get hold of it and use it to hurt others.

So in a five-minute clip posted to Facebook he used a circular saw to slice the weapon into pieces.

The post has been shared hundreds of thousands of times, and the video has been watched some 15 million times.

In it, Mr Pappalardo said he was a supporter of the Second Amendment, which protects Americans’ right to bear arms, and even had a tattoo of it.

He said: “A lot of people have said to me, ‘Well, what do you need to own a weapon like that for? Its only purpose is to kill’.

“And I’ll be honest, it’s a lot of fun to shoot. I’m not a hunter, I’ve never killed anything with it except a bunch of targets.

“I remember after Sandy Hook happened, I said to my wife I’d gladly give this gun up if it would save the life of just one child.

“That’s five years ago now, and since then over 400 people have been shot in over 200 school shootings. So I guess my words were just empty words in the spur of the moment.

“Now, here we are, 17 more lives lost, so when do we change? When do we make laws that say maybe a weapon like this isn’t acceptable in today’s society?

“And there’s a lot of blame people can put on desensitising with video games and the internet, bad parenting, mental illness, but ultimately it’s a gun like this one that takes away the lives.”

Florida shooting – in pictures Show all 10 1 /10 Florida shooting – in pictures Florida shooting – in pictures Police arrest a suspect in connection with the shooting at the Marjory Stoneman Douglas High School in Parkland, Florida Reuters Florida shooting – in pictures Parents wait for news after reports of a shooting at Marjory Stoneman Douglas High School in Parkland, Florida AP Florida shooting – in pictures Anxious family members wait for news of students AP Photo/Wilfredo Lee Florida shooting – in pictures Students being evacuated from the school AP Florida shooting – in pictures Students being evacuated from the school Getty Florida shooting – in pictures People gather waiting for word from students AP Florida shooting – in pictures Parents waiting for news on their children AP Florida shooting – in pictures People gather at a hotel where students were taken after the shooting Getty Florida shooting – in pictures Florida Governor Rick Scott speaks to the media as he visits Marjory Stoneman Douglas High School following the shooting AFP/Getty Florida shooting – in pictures Dr. Igor Nichiporenko, Medical Director Trauma, left, and Dr. Evan Boyer, Medical Director, Emergency Services, speak about treating victims and the suspect at a press conference outside Broward Health North hospital AP

Mr Pappalardo posted the video three days after a gunman used an AR-15 to kill 14 students and three members of staff at Marjory Stoneman Douglas High School in Parkland, Florida.

Nikolas Cruz, 19, has been charged with 17 counts of premeditated murder and police said he had confessed to being the shooter.

The AR-15 is the semi-automatic, commercial version of the M-16 assault rifle. It lacks the fully-automatic or burst firing options of its military cousins but can be modified to fire faster with a so-called “bump stock”, as in the Las Vegas massacre last October.

Mr Pappalardo said he had owned his weapon – and his tattoo – for more than 30 years. In a separate post he said he still supported the Second Amendment but also that the US needed to introduce “much tougher gun laws”.

Of the destruction of his rifle, he said: ”I know a lot of people are going to say I’m stupid for doing that, but this was a personal choice. I can’t live knowing that my gun’s out there and it can one day possibly commit a horrific act like the other day in Florida.”

On Monday the White House said Donald Trump had expressed his support for efforts to improve the federal background check system for gun purchases.

The US President met Republican senator John Cornyn to discuss bipartisan legislation the Texan was developing, alongside Democrat Chris Murphy, to improve federal compliance with criminal background checks.

Another gun owner, Ben Dickmann of Florida, handed in his own AR-57 rifle to Broward County sheriffs following the Parkland massacre.

He said: ”I will be the change I want to see in this world. If our lawmakers will continue to close their eyes and open their wallets, I will lead by example. No one without a law enforcement badge needs this rifle.”