[Farmer Dean]

So where did he get the receivers for the guns?Can’t buy those mail order.

[Steamburg]

You don’t have to be stupid to be crazy.

[2banana]

A semi smart person can easily build a gun from stock metal and a few machine tools...

[Still Thinking]

Guns that people build themselves are not required to be registered, Walnut Creek police Lt. Lanny Edwards said. “As long as you possess it yourself and don’t sell it, it’s not illegal to have,” said Edwards.

Impressively accurate for a state actor, especially from the PRC, but still a tiny bit off. It's perfectly legal to sell guns you make, so long as you don't sell so many it looks like you're in the business of manufacture for sale.

Also, where did the guy get his receiver? If he bought it like the other parts, it would be subjects to NICS like a complete firearm would. This article makes it sound as if you can buy all the parts online and build a gun, circumventing the background check. I guess technically you could, but only under the same circumstances under which you could legally buy a complete firearm, and not at all in Kali, so very misleading.

[Sooth2222]

The US gov’t is be happy to tell you exactly how to do this! Google “U.S. Army Improvised Munitions Handbook”. You can buy it on Amazon or download it for free.