WHAT DOES FRT-15L3 MEAN?

I've experimented with several distinct forced reset triggers, beginning with rare breeds unique. If the ATF commenced knocking on doorways however, I disassembled it, grinded it up and tossed it from the trash as I failed to will need any drama from the legally purchased trigger. Anyhow, these triggers are great. The FRT-L3 is the best I've used s