There are no new FA arms available to the public in general. With the correct license a FFL can make a FA for demonstration to or at the request of the groups that can purchase new FA arms. That is typically military or law enforcement groups.
At least that's how I understand it to work. Even a FFL can't build a full auto for his own enjoyment.
Proud member of the NRA and Texas State Rifle Association. Registered and active voter.