Guns are big business. The manufacturing of them. The importing and exporting of them. It all equates to billions of dollars.

A CNBC article says the U.S. is not only the biggest exporter of small arms, we're also the No. 1 importer, driven by consumer appetite for guns. Of 650 million firearms owned by civilians worldwide, more than 41% are in American hands, the article says.

Read the entire story on CNBC.com.