WHAT DOES FRT-15L3 MEAN?

I've tried many unique forced reset triggers, setting up with rare breeds original. In the event the ATF started knocking on doorways though, I disassembled it, grinded it up and tossed it within the trash as I failed to need any drama from the legally acquired trigger. Anyhow, these triggers are brilliant. The FRT-L3 is the greatest I've used to t