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It's June 12th and this is the Sunday edition of CNN Five Things. I'm David Rhine.

And I want to start by reading off the names of a few cities for you real quick.

Las Vegas, San Bernardino, New Town, Parklet, Orlando, Uvalding. I could go on and on and on and you've probably caught on by now.

These are all sites of mass shootings in this country in recent years.

One thing these shootings have in common, they all involved AR-15 style rifles. So this week I want to look at how this gun has come to symbolize so much carnage and senseless death in this country and if calls for tighter regulation will result in actual change.

Let's spend five minutes with CNN's Josh Campbell. He covers

law enforcement and national security from Los Angeles. So Josh let's level set here.

We're talking about semi-automatic AR-15 style rifles.

There's the M16 of course, which is fully automatic.

Those are pretty much exclusively used by the military.

But these commercially available rifles, the AR-15 style, how did they get so popular among average citizens?

Well, at the outset it's important to know that this was a weapon that was designed for war. If you look at the history of the AR-15,

soldiers needed a relatively lightweight weapon that could rapidly fire,

thus increasing the kill rate on the battlefield.

And if you look specifically at the AR-15, the designers... the Congress authorized purchase of about 8,500 of these weapons for testing.

That would later become the standard issue rifle for U.S. troops in the Vietnam War.

Now soon after it was not only marketed to the military but also to members of the public and because anything that the public has that law-abiding citizens have can also be used by criminals

...