Registration??
We don't need no stinking registration.
Form 4473 is not "registration".
In addition, legally, you are just flat out wrong. Regardless of serial number, a built out 80% receiver is NOT, "what ever you want it to be".
I suggest you familiarize yourself the proper terms, and actual text of the ATF regulations.
Last edited by antelope_sniper; 06/30/15.