Can you please explain how it works, as I really don't know. I have heard of child FRTs which I assumed to be the beginning of the process but not the parent. Some actual clarity of the system would be great.
I am not an expert, However my understanding is that for any new firearm, a FRT is issued (after verification at the Lab). That "Parent" FRT is then used as a basis for as many "child" FRT numbers, as variants are produced.
For example, the Parent FRT entry for My Restricted FS2000 is "######", and when I convert it to NR, I verify it with the CFC, and it becomes "###XXY"
in this case, The original FRT is for the firearm as imported.... the second one is related, but required another entry as the classification has changed.
Firearm X (original configuration)= Parent FRT = 123451
Firearm X (NR barrel 18.6" ) = Child FRT = 123452
Firearm X (copied by Norinco) = Child FRT = 123453
ETC.