FRT TRIGGER FOR SALE NO FURTHER A MYSTERY

Tag for information. I've an older Stag sixteen" 9mm AR with zero recoil due to its weight. I used to be just pondering one other day that a Rare Breed trigger can be a blast in that thing.This is the fresh set up so wanting to know if it just needs some crack-in? Every other Tips? I certainly cannot go heavier over the bolt fat mainly because it's