[SpeakerToAnimals]

A CNC shop in northeast Colorado teamed up with a local radio station for a few AR buildfests. The hobbyists bought 80% receivers from a vendor set up on site. The hobbyist then chucks up the blank in the machine under supervision of a machinist and makes the final part.

On site vendors and gunsmiths then assist the hobbyist in final assembly.

The radio ad said you can put anything you want on it except a serial number. These weapons are legal provided they stay in the hands of the builder. They cannot be sold or given away.

I hope this answers your question.

[Still Thinking]

Actually not true. You can sell them, you just can’t be “in the business of making them for sale”. So if you make one and later decide you don’t need it, you can sell it. But you probably don’t want to make one on Friday and sell it on Saturday, nor to make and sell 10 a year or something.