WHAT DOES FRT-15L3 MEAN?

I have experimented with various various forced reset triggers, beginning with rare breeds primary. Once the ATF started off knocking on doorways even though, I disassembled it, grinded it up and tossed it inside the trash as I did not want any drama from a legally purchased trigger. Anyhow, these triggers are brilliant. The FRT-L3 is the best I've