WHAT DOES RARE BREED TRIGGER UPGRADE MEAN?

There are some things that the FATF said were a no no plus a choose somewhere would strike down. Since it pertains to FRTs, are these lawful to get any where or is it just Texas?  Do You will need to certainly be a member of some gun legal rights org? Should you be a member of that org can you purchase them wherever?Also, I might be curious how li