WHAT DOES FRT-15L3 MEAN?

I've experimented with a number of distinct forced reset triggers, setting up with rare breeds original. When the ATF began knocking on doors although, I disassembled it, grinded it up and tossed it inside the trash as I did not want any drama from a legally bought trigger. Anyhow, these triggers are awesome. The FRT-L3 is the greatest I have appli