Outstanding trigger but... - JARD AR Module Trigger System

I've been shooting for over fifty years and this is one of the best triggers I've ever used. The adjustments allow you to control all movements of the trigger and the pull weight. The reason for the four stars has nothing to do with the quality of the trigger but with the instructions, they are terrible. This module has four screws you use to adjust the trigger, two to lock the module in place and the movements of one can affect the others. Make sure you understand what each one does before starting. On my AR 15 the trigger wasn't a simple drop-in like the add claims. Also keep a bottle of loc-tite Handy you will need it.