No, it means you don't need an FFL to transfer them, and they don't require a serial number.
You're not ever allowed to transfer or sell them, though.
Quote:...you have to cnc out the area where the trigger sets.....
Not CNC necessarily, you could do it all on a manual mill. It would just take longer.
There's a guy on Rimfirecentral that build an entire 10-22 receiver from a block of 7075 on a Chinese manual mill, and it worked perfectly.
I could build an AR lower the same way, it would just take a lot of time.