In a majority of states you can manufacture your own firearms as long as you didn't build them with the intent to sell. To do that would require an FFL. I can'

In a majority of states you can manufacture your own firearms as long as you didn't build them with the intent to sell. To do that would require an FFL. I can't remember exactly, but in California you can make your own, but it has to have a serial number. I can't remember what other restrictions they have.