FASCINATION ABOUT BUY RARE BREED TRIGGER

There are a few things that the FATF explained were a no no as well as a choose someplace would strike down. Mainly because it pertains to FRTs, are these lawful to purchase any where or could it be just Texas?  Do you have to be described as a member of some gun legal rights org? Should you be a member of that org can you purchase them anyplace?G