'Ghost guns' untraceable and legal

ATLANTA, GA — Law enforcement says it's a troubling trend; people bypassing background checks to build their own powerful military assault-style rifles.

And it's all legal.

A man used a so-called "ghost gun" in a deadly mass shooting recently. That man, who killed his wife and four others, was prohibited from owning a gun based on prior arrests. But he simply ordered the parts on the Internet, and built one himself.

No questions asked.

The “ghost guns” have no serial numbers, there is no identification needed, no background checks and it can be built at home.

Watch the full report above.