Limiting "guns" to small arms such as handguns, rifles and light machine guns, it is estimated there are 875 million guns in the world. An estimated 7.5-8 million small arms are produced per year....
1n 1994 @ 246K people had FFL's. Thanks to former President, Bill Clinton and the Congress of that era there are now less than 50k people with FFL's. Not all of those ran a "store".