From the Contra Costa Times:
From pocket-size assault weapons and sniper rifles that can kill a man a mile-and-a-half away to incendiary armor-piercing bullets, you can find what you’re looking for at gun shows across the United States.
You know the article is going to be a doozy when it starts out like this.  Pocket-size assault weapons?  I’ve never seen one of those, personally, but I suspect they are talking about the Magpul FMG 9, which appeared at SHOT.  Aside from being a submachine gun rather than an assault weapon, it’s not legal to sell to civilians. But why let facts get in the way?
In hidden-camera photos and videos captured by researchers at the University of California, Davis, men roamed gun shows with assault rifles slung over their shoulders and pistols tucked in their belts, available for sale with no waiting period, background check or paper trail.
Yes, because outside of California, where Wintenmute does his “research”, it’s legal to sell a firearms in a private sale if you’re not “engaged in the business” of selling them. Â If you’re selling firearms at a gun show as a gun dealer, you need a federal license, and the background checks for transfers. Â Conveniently left out is the fact that this is the case whether you’re at a guns show or not. Â Just last week I bought an M1903 Springfield from a guy I shoot with under the same “loophole.” Â No gun show involved.
“California is a good example of the fact that you can regulate gun commerce … without putting (gun shows) out of business,” Wintemute said.
He said he almost never saw individual sales or straw buys in California. But large gun shows take place in Reno and Phoenix.
Well, let’s take a look at California, and compare to states that border it, all of which have gun laws that are considerably less strict, and none of which regulate private sales of firearms at gun shows or anywhere else. Â California’s violent crime rate is 523 per 100,000. Â The combined violent crime rates of Arizona, Nevada and Oregon are 468 per 100,000. Â The burden ought to be on those who advocate limiting people’s freedom, to show that their policies will actually make the public safer. Â They’ve never been able to demonstrate that it does.