FASCINATION ABOUT BUY RARE BREED TRIGGER

There have already been a few things that the FATF stated were a no no and also a decide somewhere would strike down. As it pertains to FRTs, are these lawful to buy any where or could it be just Texas?  Do You need to be described as a member of some gun rights org? Should you be a member of that org can you purchase them any place?Improved Shot