WHAT DOES FRT-15L3 MEAN?

I have tried various different forced reset triggers, starting up with rare breeds primary. In the event the ATF started knocking on doorways though, I disassembled it, grinded it up and tossed it within the trash as I didn't require any drama from a lawfully acquired trigger. Anyhow, these triggers are brilliant. The FRT-L3 is the greatest I've em