WHAT DOES FRT-15L3 MEAN?

I've experimented with quite a few different forced reset triggers, commencing with rare breeds authentic. When the ATF begun knocking on doors although, I disassembled it, grinded it up and tossed it in the trash as I failed to want any drama from the legally acquired trigger. Anyhow, these triggers are brilliant. The FRT-L3 is the best I have uti